Two large nuts on each side will need to be loosened up a hair. Think they are 17mm maybe bigger. That will free up the rear axle swing so the two chain tension adjuster screws will have effect.
I just set mine snug with just a tiny bit of play. There is a technique here using ratchet straps to keep the rear axle square with the front wheels but have not tried it yet. Haven't gotten around to it. There is a couple of threads on it in this board.
Doing it by hand your rear axle will be a little crooked... guess you call that rear steer. Once you get everything tight and straight you go ahead and lock down the adjusters and lock the rear axle swing bolts.
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