Peacefirst welcome aboard! Take the belt guard off the machine. I think it was Dawn's 6th picture that showed the screw on top that you loosen to take it off. Then loosen up the bolt on the left end of the machine that holds the motor bracket. You should be able to slip the belt over the pulleys and adjust the belt's tension by moving your motor and bracket up and down on the machine. You want it just tight enough to not slip. Too much tension puts unnecessary wear on the motor and machine.
Can you take a picture of the underside of the machine? Dawn's machine looks a lot like a 201 clone to me. If it's gear driven then it probably is.
Rodney