How do you fix seat belt shoulder adjuster?

To fix a seat belt shoulder adjuster, first, inspect the mechanism for any visible obstructions or damage. If it's stuck, try gently pulling or twisting it to see if it releases. If the adjuster is broken, you may need to replace it by removing the seat belt assembly and installing a new shoulder adjuster according to the vehicle's manual. Always ensure that the seat belt is properly reassembled and functioning before use.