Maybe this will get you started...

1. Pick a key
2. Pick a tempo
3. Pick a style
4. Enter the chords for the entire chorus (verses, bridge, and verse) in a linear format. Don't worry about the repeats - you can do that later. Lots of shortcuts to copy stuff but I won't do that here. Place part markers where you want - usually at the start of the verse and bridge.
5. After the chorus is done, tell BIAB where the end of chorus is by pressing on end of chorus button. The default on mine says 32 (under the Loop and Fake checkboxes).
6. Choose # of choruses (next to end of chorus button). Mine defaults to 3.
7. Enter in your ending bar chords
8. Tell BIAB that a Tag exists and specify which bars. Press the S button for song settings. You'll see the Tag settings. You'll also want to uncheck Generate 2 bar ending.

This should get what you want. You can do repeats and stuff as you get more comfortable.

Rachael