Suzuki Grand Vitara 2006 Replacing Ribbed Belts

Hello dear community, I need your help because I need to replace my V-belt for power steering. My Vitara has the key number 7102 426 and is without air conditioning. First, I can’t figure out how to release the belt tensioner to use the new V-belt. Second, the belt tensioner can’t be turned (old V-belt is torn and removed). That’s funny to me and I don’t know if it’s now locked without a belt or if it’s actually kaput Unfortunately I can’t get anywhere with YT and find no suitable service guide. I would like to do this myself, because the car for my children is for school and driving. Thank you for your support! LG Chris PS: If it helps, I can also take pictures.