How do i tighten the belt?

My washer wasn’t spinning. I tilted it back and found the belt to be extremely loose. I notice the motor has two studs that go through slotted holes appearing to be where I can increase the tension. Sounds easy,however when I try to tighten the small nut at the bottom of those studs, they seem to tighten but I can still move the motor. Am i even in the right vicinity? I am not sure where to go from here. Also I am not sure how to remove the front panel. If i need to remove it, can you please instruct on that as well.

Thank you in advance for your help!
Tom:(