All the advice here about unfolding is sound and well expressed. I have a slightly different take.

The song structure BiaB uses and expects is:

1. Introduction (no repeat)
2. Verses (with repeats. Variation in middle choruses.)
3. Ending (2-bar, 4-bar and tag endings are available. No repeats)

I suggest you learn to use all the different endings, especially tag endings. Using the repeats and tags makes for a much more compact and efficient display on the screen.

Analyze some the demo songs to learn how BiaB thinks about song structure. Then experiment until you know how to make the tags work. There is a lot speed, convenience and power in these tools.

Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab