How do I set up and assemble the Greenworks 1800 PSI pressure washer?

First, insert the spray wand into the gun handle and twist clockwise to lock it. Then connect the high-pressure hose to both the inlet coupler on the unit and the water outlet coupler, and attach the upper handle following the manufacturer's instructions. Finally, attach a garden hose to the water inlet and plug the power cord into a grounded 120V AC outlet with functioning GFCI protection.