Use the Divvy app to find stations, purchase any of those passes, and get ride codes. For instructions, please see the App page. If you purchase a Single Ride or Explorer Pass from a kiosk or through the Divvy app, you'll get a ride code, which you'll type into the keypad on the dock. If you are an annual member, you will also receive a key to use.
Once you've successfully inserted your member bike key or entered a ride code, the light on the dock will turn green. This means the bike is unlocked. To remove it from the dock, pull the bike out by the handlebars or lift the bike by the seat to release it.