Step 1: Asses if you need to adjust the tread.
You will notice an obvious gap, on either the right or left side of the running tread.
Step 2: Adjusting the screw.
Utilizing the alan wrench that was included with your Treadly, adjust the screw on whichever side of the Treadly there was a gap (ex: if the there is a gap on the right side, adjust the right screw, turning the alan wrench clockwise at a 90 degree angle. If there is a gap on the left side, adjust the left screw turning the alan wrench clockwise at a 90 degree angle) For a gap on the right side Turning the alan wrench clockwise in a 90 degree angle,
Step 3: After adjusting, walk on treadmill and check to see if the gap corrects and disappears. If the gap does correct and disappear, the running belt has been correctly adjusted.
Step 4: If the gap narrowed but did not disappear, repeat above steps. Using the alan wrench to adjust the side with the gap that has now narrowed. Again, walk on the Treadly and watch for the belt to correct and go back to center.