How to bleed a water heater system

Two separate posts, same vague question. Even my crystal ball is stumped.

I put new batterys in my crystal ball and it still is not working properly. I guess I will box it back up and send it to the manufacturer tomorrow for repair. Dang thing was made in china to start with. All the USA manufactures of crystal balls are sending the work to china now and the German made ones I cannot afford. I wonder how much postage I will need to send it back to china?