Maint Rego Light

I just got my oil changed before the 82K mark, but now my maint rego light keeps blinking and then going off after 5 seconds of me starting the car...nothing is wrong with the engine and the car runs fine with no leaks smells or sounds...I was wondering where the computer for the car is located so i could just reset the light because i have a feeling it is just an oil change on 82k thing...let me know what u think and what to do! Thanks!

there is a botton under the dash on the right side of the steering Column hold it down utill the light goes off