How to have two affiliations for one author?

Question

Have a problem with the third author. could you please check that and let me know how can I fix that small typo?

\documentclass[review]{elsarticle}
%\documentclass[1p]{elsarticle}
\usepackage{geometry}
\usepackage{epsfig}
\usepackage{latexsym}
\usepackage[font={normalsize}]{caption}
\usepackage[para,flushleft]{threeparttable}
\renewcommand{\TPTtagStyle}{\textit}
\usepackage{booktabs}
%\usepackage{nicematrix}
\usepackage{amsmath}
\usepackage{fullpage}
\usepackage{setspace}
\usepackage{mathtools}
\usepackage{fancyhdr}
\usepackage{sectsty}
\usepackage{siunitx}
\usepackage{tabularx}
\usepackage{float}
\usepackage{indentfirst}
\usepackage{changepage}
\usepackage{adjustbox}
\usepackage{tabularx}
\usepackage{rotating}
\usepackage{makecell}
\usepackage{subcaption}
\usepackage{rotating}
%\usepackage{subfigure}
\linespread{1}
\usepackage[hidelinks]{hyperref}

% packages for tables
\usepackage{multirow}
\usepackage[table,xcdraw]{xcolor}
\usepackage{graphicx}
\usepackage{graphics}
\usepackage{caption}
\usepackage{color,soul}
\usepackage{fullpage} 
\usepackage[skip=1ex, 
            font=small, labelfont=bf]{caption}
% packages for tables
\usepackage[table,xcdraw]{xcolor}
\usepackage{multirow, tabularx}
\usepackage{tabularray}
\UseTblrLibrary{booktabs, siunitx, varwidth}

\usepackage{enumitem}
\usepackage{lineno,hyperref}
\modulolinenumbers[5]



%\usepackage[normalem]{ulem}
%\usepackage[usenames, dvipsnames]{color}


%\usepackage{nomencl}
%\usepackage{cite}

\usepackage{natbib}




%\usepackage[numbers,super]{natbib}
%\setcitestyle{numbers,super}



\usepackage{enumitem}

\usepackage{lineno,hyperref}
\modulolinenumbers[5]



%\renewcommand{\thefootnote}
\newcommand\degrees[1]{\ensuremath{#1^\circ}}

\newcommand\mycaption[1]{\caption{\footnotesize{#1}}}

\newcommand\myfootnote[1]{\footnote{\small{#1}}}

\newcommand\scalemath[2]{\scalebox{#1}{\mbox{\ensuremath{\displaystyle #2}}}}


\renewcommand{\TPTtagStyle}{\textit}

\newcommand{\splitcell}[1]{\begin{tabular}{@{}c@{}}#1\end{tabular}}


\captionsetup{skip=0.333\baselineskip}
\usepackage{calc,ragged2e}
\hyphenation{gauss-ian}

\setlist[enumerate]{label*=\arabic*.}




\journal{MSSP}


\bibliographystyle{elsarticle-num}


\begin{document}
    
    
        
    \begin{frontmatter}
        
        \title{Prediction ofthrative Study} 
        
        %\tnotetext[mytitlenote]{Fully documented templates are available in the elsarticle package on %\href{http://www.ctan.org/tex-archive/macros/latex/contrib/elsarticle}{CTAN}.}
        
        %% Group authors per affiliation:
        % \author{Elsevier\fnref{myfootnote}}
        % \address{Radarweg 29, Amsterdam}
        % \fntext[myfootnote]{Since 1880.}
        
        %% or include affiliations in footnotes:
        
    
        \author[mymainaddress]{Toddrkfffffhd}
        \author[mysecondaryaddress]{Farderzd\corref{mycorrespondingauthor}}
        \cortext[mycorrespondingauthor]{Corresponding author}\ead{s1d32@studendedud}
        \author[mythirdaddress]{Rdais Kd}
        \author[myfourthaddress]{}
        \author[mysecondaryaddress]{Pidzuko}
        \author[mymainaddress]{Mgdafoszyk}
        \address[mymainaddress]{InstidFluid Fdhinery, Poh nces, dsk, Podd}
        \address[mysecondaryaddress]{Gddity of Tecogy, Faculty dtronics, Telecons and datics, Gk, Pddd}
        \address[mythirdaddress]{Compotelogies dence, Sabanci da, Pendd06, Inbul, dy}
        \address[myfourthaddress]{College of Aedl Enring, Natdvedy ofences ology, dd, Padn}



        \begin{abstract}
        
        
\noindent Plain weavefgsdgsdfsdf

        
        \end{abstract}

\end{document}

Answer 1

Let me first comment about your preamble. You're using elsarticle, so your paper will be submitted to some journal.

They surely don't want to see any layout customization. So, start with removing

geometry fullpage setspace fancyhdr sectsty float indentfirst changepage

Now have a look at what remains:

1. you load caption three times with contradicting options; remove these calls and just leave subcaption; also remove the \captionsetup setting;

2. epsfig and latexsym only exist because 30 year old document may need them; remove them;

3. loading graphics, just use graphicx;

4. rotating is loaded twice

5. color and xcolor are loaded a total of 4 times; loading both is anyway nonsense;

6. lineno and hyperref are loaded several times and almost always together for no apparent reason; note that hyperref should be loaded last, except for a few cases;

7. \linespread{1} is useless;

8. using \mycaption and \myfootnote to override what the class does with captions and footnotes is a big advance towards rejection of the paper;

9. instead of hand-defining \degrees, why not use \qty{32}{\celsius}?

10. do you really use \scalemath?

Now look at the proposed version, but, for your own sanity, do remove what you don't use in the document.

How to specify two addresses for one author? Specify both keys in the optional argument:

\author[mythirdaddress,myfourthaddress]{Rdais Kd}

Full code.

\documentclass[review]{elsarticle}
%\documentclass[1p]{elsarticle}

% general packages
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{adjustbox}
\usepackage{rotating}
\usepackage[table,xcdraw]{xcolor}
\usepackage{graphicx}
\usepackage{siunitx}
\usepackage{subcaption}
\usepackage{enumitem}
\usepackage{calc}
\usepackage{ragged2e}
%\usepackage{natbib} % elsarticle uses it anyway

% tables and friends
\usepackage{booktabs}
%\usepackage{nicematrix}
\usepackage[para,flushleft]{threeparttable}
\usepackage{tabularx}
\usepackage{makecell}
\usepackage{multirow}
\usepackage{tabularray}
  \UseTblrLibrary{booktabs, siunitx, varwidth}

% special packages
\usepackage{lineno}

% hyperref
\usepackage[hidelinks]{hyperref}

% settings
\setlist[enumerate]{label*=\arabic*.}
\modulolinenumbers[5]
\renewcommand{\TPTtagStyle}{\textit}
\hyphenation{gauss-ian}

% personal commands
\newcommand{\splitcell}[1]{\begin{tabular}{@{}c@{}}#1\end{tabular}}

% special for elsarticle
\journal{MSSP}
\bibliographystyle{elsarticle-num}


\begin{document}
    
\begin{frontmatter}
\title{Prediction ofthrative Study} 

\author[mymainaddress]{Toddrkfffffhd}
\author[mysecondaryaddress]{Farderzd\corref{mycorrespondingauthor}}
\cortext[mycorrespondingauthor]{Corresponding author}\ead{s1d32@studendedud}
\author[mythirdaddress,myfourthaddress]{Rdais Kd}
\author[mysecondaryaddress]{Pidzuko}
\author[mymainaddress]{Mgdafoszyk}
\address[mymainaddress]{InstidFluid Fdhinery, Poh nces, dsk, Podd}
\address[mysecondaryaddress]{Gddity of Tecogy, Faculty dtronics, Telecons and datics, Gk, Pddd}
\address[mythirdaddress]{Compotelogies dence, Sabanci da, Pendd06, Inbul, dy}
\address[myfourthaddress]{College of Aedl Enring, Natdvedy ofences ology, dd, Padn}

\begin{abstract}
Plain weavefgsdgsdfsdf
\end{abstract}

\end{frontmatter}

\end{document}