How do set radio defaults on 2008 Cadillac STS?

To set radio presets on a 2008 Cadillac STS, first, tune to the desired radio station using the tuning knob or buttons. Once you have the station, press and hold one of the preset buttons (1-6) until you hear a beep, indicating the station is saved. Repeat this process for any additional stations you want to store. To access your presets, simply press the corresponding button.