I have my code but dont know how to put it in my 2006 Chevrolet radio

This is easy, you will need a 7mm socket. To the right of your radio you will see the end of the square trim bezel around the radio, air bag switch, hvac controls ect, start by pulling firmly on that panel, you'll then start pulling toward the drivers door carefully getting the panel looser and looser, drop your steering wheel down with the adjuster on the bottom left of the steering column and remove the panel, next remove the 2 7mm screws on the left of the radio and the 1 7mm on the right of the radio, remove the radio and electrical connections, reverse for install.