On your FX 1 select a suitable reverb like the SMR. On FX 2 select the 2tap delay.
Now press the FX1 button on the right side. You are now looking at the FX buss. Raise the fader for mics 1 and 3. You should hear reverb. This is assuming that the sends and returns masters are up. They appear on the upper layer. Usually up from factory.
Press FX 2 and then raise the fader for mic 1 or 3. That will add delay. You do this for any mic channel that you want FX added. Hope that helps.