Can I add lyrics to my tabs?
Yes -- you can add multiple lines of lyrics to a measure using the Lyrics notation (press Y or use the Lyrics button in the notation palette).
Because Tabular is designed primarily as a tablature editor, this feature is intended for writing out lyrics that accompany the instrumental music that you write in the app. Writing out specific vocal melodies with lyrics tied to each note is not well-supported at the moment.
Tabular: Using the App
Tabular: Import and Export