1. Make sure that there is no sundries and pressure on the binding belt, so as to avoid accidental injury when untied.

2. Find the tensioner on the binding belt. The tensioner is usually a device made of metal or plastic, which is used to adjust and lock the tension of the belt.

3. Observe the tensioner and look for the release device. (The shape and position of the release device may vary according to the brand and type, and it is usually a button, lever or switch).

4. Operate according to the type of release device. (Some release devices of tensioners need to press the button or lever and keep it pressed; Some need to push the switch in a specific direction).

5. Continue to hold down the release device and gradually loosen the tension on the belt. Patience and gradual relaxation are needed to avoid the danger caused by the sudden loosening of the seat belt.

6. When the belt is completely loosened and not tight, you can loosen the pressure of the release device.