There are several ways to fix adverse yaw. Yon can program a aileron to rudder mix. You can program the down the aileron to go down less than up up aileron goes up. The old school way before computer radios, move the servo horn by 1-2 splines. Instead of the horn being 90 degrees at neutral it will be off slightly either for or aft. Forward if the servos are installed in the bottom of the wing & aft if they are installed in the top,of the wing. You will need to adjust your pushrods and trim according.
Your servo horns installed incorrectly, aft when they should be for, will cause the down aileron go down more than the up goes up. It’s the extra drag from the down aileron, fighting against the turn, that is cause of the adverse yaw not the dihedral. You always want the extra drag to be on the up aileron to help pull you around a turn.