You don't enter lyrics on the leadsheet window. You can enter them on the notation window, and then they will show on the notation window and the leadsheet window (if Print Options - Line Lyrics is enabled)

This is the lyric area I'm referring to (screenshot from Windows version , but same on Mac)

http://screencast.com/t/CapG2XWYqqF


Have Fun!
Peter Gannon
PG Music Inc.