i'm on a window and here i put them on
C:\Documents and Settings\User\My Documents\maya\7.0\scripts So probably, if there's a counter part of a main document folder somewhere in ur hd, there's also a folder that maya put in when u installed it. go in that folder, find the folder with the version no., go to scripts, paste that mel file and wala! Restart maya if u have it open, if not open it, open the writer thingy (where u write mel scripts) and then write the keywrods for that script(there is something like this that the programmer of the mel usually puts, it's a kleyphrade usually almost identical to the name of the script)onece it is written, drag it with your middle mouse button to the menus and a new menu will come out or in the shelf if it's a button. ask if u don't totally get me lol.