[Valentino]

It's not a script, It's just his terminal history that you can use as a guide.
Unless you have a user named niluje and are running gentoo, you will need to change the paths and --prefix= in the configure lines, paths to source code in his portage tree etc. It's pretty specific to his system so you will need to adapt it a little.

It's pretty easy to do but if you've never used linux before It might be a little confusing.

/edit
To your original question, that just means to edit it in vi.
vi is a modal text editor, for basic editing you would move around in command mode with hjkl keys, get to where you want to edit push i for insert mode and type.
:wq is write quit. It would be best to find a vi tutorial on the net before using it though.