You have solder point on that FC already.
Top Right hand corner…
AGND RAM VOUT
AGND RAM VIN
AGND = Ground
RAM = Positive (Check the voltage on that pin… Dont fry anything)
VOUT = VTX
VIN = FPV Camera.
WARNING depending on the setup of your board that RAM pin can be as much as 14vdc if your running a 4S raw Lipo power.
Check the configuration and solder brigdes before powering up.