nitrohuffer

This is a 2018 BMS Ranch Stallion.

Hey Folks, I have a BMS Ranch Stallion 4x4 that has been a really good UTV. I have recently burned the belt out by using it to get a tractor back on its feet after someone dumped it on its side. I found the belt online (380.00 bucks) and I have pulled the cover off to expose the belt. I pulled the old belt off but can not figure out how to reduce the tension on the pulleys. I do not know how to loosen the nut that hold the clutch on as it just spins the whole drive, how do i hold the spindle the nut threads onto? I can not find anyhing on the web about the bms ranch stallion and belt replacement. Anyone ever work on one of these?