All you have to do is go into the I-drive menu and find TPMS reset option. I think it asks you to confirm you want to do it, and then just drive. After awhile, assuming you don't have defective or the wrong type of sensors, they'll work. Note, they do have internal batteries, and eventually, those will die, requiring you to replace the whole sensor. If you're lucky, and you bought OEM ones (TireRacks are not - they're an aftermarket version), if they die before the warranty runs out, BMW will replace them, otherwise, you're on your own.