4) Typed ':wq' [Enter]

5) Closed the Terminal window.  When I closed the window, a dialog box popped up saying 'Do you want to close this Terminal window? Closing this window will terminate the running processes: vim.'

I didn't know what to do, so I closed the window anyway.

Nothing seems to happen. 

I really need an idiots guide here.  I can do other things - play guitar, write music, DJ - but this Terminal stuff is really not my thing.  I didn't know what I was getting myself into just by installing Firebird.