2004 Ford F-150 safety belt

My daughter pulled my passenger safety belt around the back of the seat, pulled it tight, locking it. I cannot move my seat up or back because of the safety belt being locked. I can't have anyone sit in the front seat because they cannot buckle up. I have taken the side panels off where the belt goes behind. I thought there was a release for the belt, but I cannot find it. The belt is still buckled so the buzzer doesn't sound if anyone does sit in the seat. I have tried everything I could think of, the belt just gets tighter and tighter, now I cannot move it at all. Is there a release that can be used? My husband wants to cut the seat belt, I don't think that is necessary.