If you purchase a membership at the kiosk, you may select a bike by it's dock number. The dock will beep indicating the bike has been unlocked and is ready to remove.
If you buy a year-long membership, you will be sent a BCycle card. Use this card to quickly unlock bikes from the dock without using the kiosk. Push the silver button on the bike's dock, then touch your card to the square behind the button. The dock will beep, indicating the bike is unlocked.
If you already have a membership but do not have your BCycle card, use the kiosk to sign in. Use the same credit card that you used to purchase the membership to access your account.