How do you set 15lbs pressure on 92012 mirro pressure cooker?

Well honey, to set 15lbs pressure on a 92012 Mirro pressure cooker, you need to make sure the pressure regulator is in place and functioning properly. Once you've got that sorted, just heat the cooker until the pressure indicator reaches 15lbs, then adjust the heat to maintain that pressure. It's as simple as that, darling. Just don't go blowing up your kitchen now!