I changed batteries in both key fobs and they are now not working. I have to use the key to open door which sets alarm off then start car pushing stop/start button with fob to turn alarm off. There is no key ignition.

Does anyone know how to reprogramme key fobs? YouTube shows videos where you put key in ignition but my car does not have one. I also have to start car to turn off alarm before doing anything. I'm not sure how much I would be charges taking it to garage so trying to fix by myself (with your help!).