The bind plug connects to the battery pins - when looking at the stock setup from the boom side its the vacant pins on the far left. The ESC provides power through the throttle connection. If you use an external BEC like I do, you have to wedge a wire into the unused top pin and short it to earth.

Yeah, adjusting with trim or subtrim will be fine for the short term, providing you are not flying full on 3d that is, as it may stuff up the full travel points.