The first thing you need to do is to flip over the first skate and up the wheel side. Identify the location of the two external tension nuts at their hubs
Attach the right socket wrench to your wrench’s ratchet body.
Fit the wrench on to the bolt and turn the handle right and left properly.
Test the tightness of the nut with your fingers. Loosen or tighten as necessary. It should be mediumly tight.
Do the same with other nuts.