Ppm board?

Slipzfpv

New member
So I'm just getting into the racing drone hobby and to save some money with the tx&Rx I went with the flow i6-b combo reliever. So the board I want to get is supposedly ppm compatible. But I don't know where to solder it to. The stack I'm using the the xrotor 45a 4in1 esc and the f4 fc. So if you know where to solder the signal to hit me up