There was instructions with these things?!?
The center cap should come off the roadwheel to reveal a screw to remove the wheels from the axle, once the wheel is off you can access the screw for the swing arm. If you have to destroy the center cap, you should be able to get replacement ones from the likes of IMEX or Forgebear. Return wheels are pinned in place, you might be able to prise the 2 halves apart to access the pin, but you are probably better off just trying to press the pin out from the inside with some kind of dowel?
In sumary; prepare for the application of brute force, and not a little harsh language..

Good luck!