hydro pumping

Ok I’ve been pumping with my bathmate wide boy hydromax7. For last month and half. I am circumcised, what do i do keep my pump and girth , also i do take adderall here and there and it pulls all blood out of my balls and penis. After several hours and it wears off usually go back to normal.

How do you know how much pressure to use? I don’t want to cause any harm on myself. Using the Hydroxtreme. Thanks