You can be seriously hurt if your shoulder belt is; too loose. In a crash, you would move forward; too much, which could increase injury. The- Page 38

1-32

The safety belt locks if there’s a sudden stop or a crash,
or if you pull the belt very quickly out of the retractor.

CAUTION:

You can be seriously hurt if your shoulder belt is
too loose. In a crash, you would move forward
too much, which could increase injury. The
shoulder belt should fit against your body.

To unlatch the belt, just push the button on the buckle.