If yours is like the one I worked on years ago there are two I believe 3/4 inch bolt heads sticking out of the back of the backing plate which control adjusting cams behind the shoes.
They should be located at approx 10 o'clock and 2 o'clock.
One adjusts each shoe, to tighten the shoes put a wrench on each one so the wrench is straight up and down and move the top of the wrenches away from each other, you may need to use a ratchet or other to get at the adjuster nuts but what I described is just to indicate which way to turn the adjusters.
Wheels off the ground tighten until drag is felt, then back off a bit X 4.
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