Newbie set up with wiring

Hi im new to this i have almost set up my laser but im stuck with wiring i have plugged everything in to the manual / video but am left with yellow wires please help.

That yellow earthing wire slides under the screw that holds the front left ‘leg’ to the rail, just underneath the limit switch
Also, the red wire should be put into the left connector on the limit switch and the yellow and black wires into the middle connector.

Thank you
i just followed the video on you tube for the wiring