Turn the wheels at each corner and in the middle so that a piece of paper can slide between the nozzle and the bed with slight resistance.

Do this at least twice to make sure that the paper can move between the bed and nozzle with little resistance.

On the printer's screen, tap each of the four corner points and home one at a time.

The nozzle will move to each selected corner.

At each corner, adjust the bed to set the correct distance between the nozzle and the bed.