It depends on what you are trying to do. If you just want the motor to run the other way, just interchange 2 of the three leads going from the vfd to motor. If you are trying to turn the motor from forward to reverse and back from a remote switches, you will need too give me a lot more info.
I have mine running the spindle on my mill running mach3 and I get for/rev and Spindle spped control. It took awhile to set up but it is worth it.