Tpms problem

I just recently bought a set of bfg all terrains and they require a higher psi than my stock tires the place that put my tires on set the pressure so that the tpms light wouldn't be on but now it looks like my tires are going flat I've researched if you could set the higher and apparently you can but nobody will tell me. Tpms made easy says I have to buy a manual to learn how does anyone know of a way to set the tpms setting higher my bfgs call for 40psi and the tpms light comes on any higher than 32 psi

 

Air up all tires to about 5psi below where you intend to run them.
Follow the instructions in the owner's manual to use the reset button under the steering wheel to set the ECU to the new pressure.
Increase the pressure to where you intend to run.

You will now not get a light until there is a 10psi difference between two tires, or when one tire drops below your set point.