Now just screw on the controller to the back beam in an upright position (it was the easiest way to fit it in). Next mount the line sensors to the left part of the beam that extends out (see picture).
Then plug everything in as follows:
-right wheel motor into motor #1
-left wheel motor into motor #2
-mop servo into motor #3
-front roller into motor #8 (you will probably need to use an extension cord to reach the controller)
-right line sensor into input #1
-middle line sensor into input #2
-left line sensor into input #3