THANK YOU!! I think I got it now, i was just confused with the "extra" pads next to the usual "IN, GND, SW, OUT."
So just to confirm:
1. "IN, GND, SW, OUT" bottom of Blue Breaker board -> "IN, GND, SW, OUT" on Breakout Boost board
2. "-" and "+" from Breakout Boost board go to the 9v power...