Draught Beer

What should be my beer regulator be?
I connected my co2 to the barrel (which has been sitting for more than two days) and still get nothing but foam. Someone told me that my controller is probably the wrong position. What should you be in?
This will depend on temperature of your barrel. It will be in the range of 10-20 psi psi. More importantly, balance the pressure barrel with resistance from the beer line. Once a system balanced foaming should disappear.
Funny Carlton Draught beer advertisement