So in order to set up builds to use with the Build^ button, we need to go through each of the section buttons and highlight the build we want to use. Then the Build^ button will take from those builds we've highlighted. Yes? It sounds like an optional step is to hit the "all active builds" button to check to make sure the builds we want are listed.
It also sounds like "selected" and "active" mean the same thing here.
(Thank you again, by the way!)
Edit: Yep, I tried it (but didn't hit the Build^ button, since I'm in the final stages of a run) and I follow you now.