I have a Makita DCS640120 Commercial Grade 20Inch 64cc and when i turn it on the chain automatically moves how do i fix it to where it will idle till i press the trigger?

If clutch springs are not broken turn down idle screw until chain stops spinning

Turn the idle speed screw CCW till the chain stops turning at idle, but the engine continues to run. Make sure the carburetor fasteners are tight. Remove the chain cover, bar, and chain. Spin the outer drum of the clutch to check the bearing which lies between the drum and internal components. If it doesn't spin freely, try oiling the drum bearing area and work it into the bearing. If no help, plan on replacing the clutch mechanism. Hope some of this helps!