Installing plugin for Emacs

Question

I'm using this instructional page to install a Prolog plugin for Emacs, and it says the following:

In a nutshell, place the downloaded file where Emacs can see it, 
and insert into your ~/.emacs or ~/.xemacs/init.el the following 
lines:

What does it mean to place a file where Emacs can see it, and how do I insert into ~/.emacs?

Answer 1

"Place a file where Emacs can see it" means placing the file prolog.el in a directory devoted to additional per-user Emacs-specific files, e.g. in a subdirectory of ~/.emacs.d/ (like ~/.emacs.d/elisp) and if needed, adding that directory toload-path.

The other instructions refer to modifying the standard Emacs initialization file, e.g. ~/.emacs.d/init.el. Insert the lines given in those instructions into your own Emacs initialization file, then save the file and restart Emacs.