How to adjust the DR Trimmer premier belt when not cutting or spinning head

How to adjust the DR Trimmer premier belt when not cutting or spinning head. Please read the manual and do adjustments with the Dr Trimmer premier off.
I have a new DR Trimmer premier and the unit stopped working while cutting grass. Here is a quick guide on how to get the head spinning before we go replacing belts. The DR Trimmer has an adjuster that requires a few counter clockwise turns. I did the adjustment while the unit was on for demonstration of sounds and visuals of strings. Please read the manual and adjust with the unit off.