This picture is from the manual for a DP-29F, a similar belt-drive turntable:
The view is through the rectangular hole in the platter you see with the turntable mat removed. This picture is from the setup section for a new turntable, so the ribbon tape won't be on your belt. But it shows how the belt should go around the drive roller (it's the shaft of the drive motor underneath). Other than the routing of the belt over the roller, there's nothing else to connect. If the belt is working correctly (hasn't stretched so it's too loose), the roller drives the belt which in turn spins the platter. If your turntable isn't turning, either the belt is too loose to transmit the motion, the drive motor isn't spinning, or something is binding and preventing the platter from turning.
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