Place a blank record on the turntable platter and start the turntable.
Move the tone arm so that it sits on the record.
Note the direction that the tone arm moves on the blank record. If the tone arm moves toward the center of the record, you need to increase the anti-skate. Movement toward the outside of the record indicates a need to decrease anti-skate. If the tone arm stays in place, you don't need to adjust the anti-skate.
Turn the anti-skate knob near the back of the tone arm clockwise if you need to increase the anti-skate, or counterclockwise if you need to decrease the anti-skate. Start with a quarter turn of the knob.
Retest the tone arm and continue to make adjustments until the tone arm stays in place on the record.