I am sorry to post this probably very basic question, but I am having a hard time locating my unsrt.bst file as I want to edit it. I have read through a lot of questions in here, but in all of them it seems implied how you find the unsrt.bst file. Sometimes it is written that it is placed in Library/textmf/bibtex/bst, but I can't find any of those folders.
From your last comment about the location for personal bst files I'm guessing you are using a Mac. Under TeX Live installed by MacTeX your personal tree's root is ~/Library/texmf and personal bst files should go into ~/Library/texmf/bibtex/bst or sub-folders of that folder. A couple of things you should know: ~/Library is the Library folder in your HOME folder; and, if you haven't done so already, YOU must create the set of nested folders texmf/bibtex/bst/... in ~/Library. To open ~/Library hold the Option key down while clicking on the Go menu in Finder; a new Library item, that opens ~/Library, will appear.