My power cable is no longer powering the rest of my controller

I've managed to take it apart and take a look inside, and i’ve found that a part came loose and I can't quite figure out how to fix it. The gamecube controller I have is from GameStop, and a 2019 version. (It doesn't have the smash symbol on it). A wide small bent T looking part that connects to the power wire has gotten out of place, and although I see it connects to it I can't figure out how to put it back.