Re: pulls right
If the boat is pulling to the right you adjust the trim tab to point to the right and vice-versa.
If you have power trim & tilt, adjust the tab to compensate for pull when you've got the motor trimmed out as you would normally run it. Trimming in and out from this position will change the affect of the trim tab and can make the boat pull a bit.
Check your prop for damage, and check the hull for any obstructions or change which might cause the boat to pull.
HTH............ed