You may cancel your membership within 14 days of purchase to receive a refund. Please contact Customer Service through this form.
If more than 14 days has passed since you signed up for a Citi Bike annual membership, there is not a way to cancel your account, but you can turn off auto-renew so that your membership expires at the end of your 365-day commitment. To do this, log into your account online and adjust the auto-renew settings.
Once your membership is canceled or expires, there is no need to turn in your key. If you'd like to recycle it, simply drop it into any plastics recycling bin.