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Connect Mixer to your RC reciever
Connect the servo cables to your RC reciever. The first input is the one closest to the left side of the mixer.

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It's the simplest way to setup mecanum wheels. Just follow the instructions.
Works good
Worked fine after I figured it out, but you didn't provide enough info for this; here are the three biggest things I'd have liked to know. The preinstalled jumper to the left of the outputs will cause it to run a 'test mode' where it runs front left, front right, rear left, rear right, then pause; in order to actually use the thing, this jumper must be removed. The input wires are labeled thus: Yellow is forward/reverse, Blue is strafe, and no label is rotate. Hot swapping wires does not usually seem to achieve the desired results; you often must power cycle the mixer.
(AndyMark feedback: Thank you for this input. We will add more documentation.)
Purchased for an off-season study project into the mecanum-drive arrangement.