The first thing I do when working on a new song in BB is to UNFOLD the song so it doesn't have repeats. I want it to start at the top... bar 1 and proceed down the screen to the bottom where the song ends.
As far as endings.... if the standard 2 or 4 bar ending doesn't get the job done.... just create your own ending. You need to learn how to add bars, delete bars, as well as how to copy and paste bars. It's really very simple to do those editing functions. Once you have that down, you can generally do a custom ending in a matter of just a few minutes time.
For a "tagged" ending, you need a sufficient number of extra unused bars near the end.... you copy the 4 bars you want repeated and paste them into the places where you want the tags... and then you can edit the final few to complete the ending.
This song
One More Round is a good example of a song where I created my own ending and did not use the 2/4 bar canned ending.
As always, if you have questions, it's best to see if you can find the answer in the tutorial videos PG has on the website, look it up in the manual, or when all else fails, post it in the proper forum site being as specific as is possible while providing as much info as possible as to what you have done to try to solve it.
we will help, to the best of our ability to get you going in the right direction.