What issue are you having with it, installing or actually setting the desired boost level?
There are 2 settings, duty cycle (boost level) and gain response.
To set boost level:
Hold top button for 5 secs, enter desired level (start low), say 18 (note this does not mean 18psi).
Once its set, dont touch any buttons for 5secs, you'll then here the solenoid ticking, at this stage you need to drive the car in a spirited fashion under load and then see what the boost reached.
If not happy with the boost level then start the cycle again gradually raising the duty cycle.
This is what I had to do with mine, not sure if the newer model has changed.
But I had to drive the car to set boost, as the fuzzy logic learns your turbo setup.
To set gain response is the same as above, but hold the bottom button.