remote start on 2003 GMC Yukon Denali

i bought a 2003 denali used ..i did'nt know i had remote start...some how i started the truck two time already ..what button am i pushing to start it or how do i use the remote has loc, unlock , and ax button which one start the truck

Asked by for the 2003 GMC Yukon Denali
It is the lock button that is starting it. I did the same thing when I bought my car.
thank you ..i'm go and try it ..hahaha