First of all, add a Part and have the
Properities Menu open.
Scale up the conveyor belt so it is long.
Now, Move the Conveyor belt 1 stud in the intended direction. Watch the
Position Values.
Which value changed?
Did it increase or decrease?
Now Anchor the part by setting Achored to true, and then go to the Velocity property
and change the value that changed earlier, and increase or decrease
it by 5 to 10 dpending on if the earlier number did
Now Enter the world, and stand on the conveyor belt. If you move
on it, then it is working.