Seems to be pretty logical, doesn't it?
You don't. The pulley is pretensioned by the manufacturer. If the belt tension is incorrect, the pulley must be replaced.
Tighten the center bolt on the pulley and if it's tight and still wobbles then replace the pulley.
There is no fixing it. It must be replaced.
No, tensioner pulley is at a preset tension, no adjustment can be made. If there is slop in the belt, the spring loaded tensioner should be replaced.
You don't. The serpentine belt tension is automatically maintained by the tensioner pulley, which is an idler pulley located on the passenger side of the system and looks like it doesn't drive anything. If the belt tension is incorrect, the tensioner pulley must be replaced. If the question meant 'how to release tension from the belt' (for removal, etc.), this is done by applying the correct size socket wrench to the tensioner pulley's center nut and rocking the pulley away from the belt.
You don't. If it has stretched too much for the tensioner pulley to handle, you need a new belt. Or, if the tensioner pulley is not applying correct tension, the tensioner pulley must be replaced.
The tension spring is broken, and the entire assembly must be replaced.
If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.If you are referring to the Serpentine belt, you loosen no pulley. You simply remove tension from the belt. The tension is applied by the Idler Pulley. Pry the idler back and remove the belt.
put it on the tension srewand push back towards muffler
The tension pulley should have a bolt that holds it on, allowing you to replace the unit.
Check the tension on the belt. A power steering pump will whine if there is too much belt tension, putting pressure on the side of the pulley.
You did not mentioned the fan belt. That is the usual cause.