Your body weight on the seat keeps it upright. Although some people envision a problem with tipping, you will find that in actual use, they simply do not have the unstable feel that people imagine. We do not fasten the seat to the bleachers. Fastening seat would restrict mobility and limit its use in the reclining position. Non-skid safety track strips on bottom will keep you in place.
Instructions are on the back.
The seat back can be lifted allowing it to hinge back and lean on the bleacher behind you. Position the seat frame forward or back to get the desired angle. This is only useful if the bleacher behind you is not occupied. The structural strength of frame has been tested to accommodate a 350 to 400 lb. If it breaks, send it back.