How do I adjust the pressure contained by my mega flow.? I think it should be set to 2 slab but it is...

I think it should be set to 2 slab but it is at 1/2 bar. The sign with instructions is on the subsidise of the tank. I can perceive the label but not see it. Not the best installation??
Answers:    I wouldn't recommend touching it. Engineers need a 'G3' qualification to work on unvented hot dampen, if these water storage vessel are set-up wrong, or by someone who doesn't know what they're doing, the results can be catastrophic!!!

Call an engineer and sort sure he has the relevant diploma.
Don't touch yourself yet please! Megaflow hold their own website that will give full instructions.