Instead of DiSEqc 1.2, you need to select USALS and put your latitude and longitude into the correct fields that will appear when you select USALS on the receiver.
This will automatically move the motor. You
installer should have not only aligned your TRUE SOUTH satellite, but also the ones at the east and west ends of the arc.
Give that a try and see if your motor moves. If not, come back here and we'll be glad to help!