Using LilyPond first time

[Carrie Stankiewicz]

Hi - I just downloaded LilyPond for Mac OS (intel).  

It pops up a screen that says,

LilyPond has been installed successfully and then tells me to :

Save the file the select Compile > Typeset file, etc., etc.

However, I can't figure out how to save the file.  

And the LilyPond menu is blank!  Can you help me?

I'm running Mac OS Leopard (version 10.5).

Thanks so much.