# How can I add a new adress line within cvmodern style

I'd like to have 3 lines for adress with cvmodern style. So I've added this lines in my file

\makeatletter
\makeatother



but nothing has changed. Can anybody tell me how can I do?

-

The easiest solution is to simply use multi-line arguments, i.e. \address{Street}{Town\\Country}.
Your definition doesn't work, because \address only stores the information. The actual printing is done by the \maketitle command, which is redefined in the corresponding .sty file, i.e. moderncvthemeclassic.sty.