Well actually, I don't think you will need help on this topic. The UI is simple and intuitive that you can figure it out yourself.
Anyway, here is what each menu does. Click on the item for which you need help.

File New Game Open Game Save Game Exit	Levels I Dunno Chess Novice Intermediate Expert	Moves Undo Propose Draw Resign	Options Rotate Board More Options Stop Music Refresh	Help Contents Castling? About