Remove the screws on the swivel support and "loosen" it.
Replace the old belt with a new one.
Perform installation in reverse order.
PRACTICAL ADVICE
Installing the drive belt
Never "press" a new drive belt into the belt pulleys with a screwdriver. By creating fracture points in the belt lining, you are already programming the next unexpected replacement soon. After installing the already used belt, run the engine for about 3 minutes and then check the belt tension again. Before stopping the engine, accelerate the engine briefly at medium speed several times. After 1,000 kilometers, check the belt tension again (3-5 millimeters).