I am assuming you are on " Step 11B: Adjust Chain Lengths - CHAIN OFF BOTTOM ONLY" of the guide.
If you got this far then the motor must have moved already. If they fail to move for this step then check connections and run the motor test.
The picture is generic and it does not matter that it shows the L bracket and not the Ring. Would be nice if this was updated though.
Read the instructions linked above, making sure that the chain wraps around the sprocket the correct way. When it is done feeding you will grab the long end of the chain and attach it to the sled. Make sure the chain does not skip or tangle during the whole operation. It takes a while.
If you get through the whole process find the ‘groundcontrol.ini’ file which will be in the current users home directory. Then upload it here using the 7th button from left (with the up arrow) in the comment edit window. We can then check it to make sure the calculated values are in range.
Let us know how you get on.