1. Turn the seat belt adjustment buckle to one side of the seat belt, and make sure that the groove of the buckle faces the inside of the seat belt.

2. Starting from the back of the belt, insert the fixing needle into the small ring of the belt buckle.

3. Pass the fixing needle through the small ring, and then through the small ring on the other side of the belt.

4. Repeat the above steps, and pass the fixing needle through each pair of small rings in turn until the seat belt adjusting buckle is completely fixed on the belt.

5. Ensure that the seat belt adjusting buckle is installed firmly, and you can pull the seat belt to test the stability of the adjusting buckle.