How do you use a Morley rfs-2 AB switchbox correctly?

I have a Morley RFS-2 also. It will only work for certain amps. It's not really an AB switch; what it does is turn effects on an off. For example, if you had an amp with a chorus effect and reverb effect, there's a good chance the back of the amp will have 1/4in jacks labeled "Reverb" and "Chorus." You would send a cable from the RFS-2 to the corresponding jack on the amp to turn the effect on and off. If you have a two channel amp with a 1/4in jack labeled "Footswitch," you can use one of the switches on the pedal to change channels. Hope this helps.