On that Rx, I'm sure you know this, but I'm going to post it anyway lol. The red wire is what you will run to the 3.3 pad. The black wire will go to one of the pins that is on the front of the board. If you are looking at the quad from the front, you will put the black wire on the far right pin. And the yellow wire will go to the signal pin that is on the far left when viewing it from the front.