If you've forgotten your password, reset it at foursquare.com/forgot_password. If you don't receive the reset email from us (and you've checked your spam filter), you may have a typo in the email address you signed up with. To fix this, answer 'no' at the bottom of this FAQ and let us know your Foursquare ID, email you believe you signed up with and date of birth for security purposes. Someone from our team will be in touch with you as soon as possible to help retrieve your password.
If you are logged in and simply want a new password, you can make the change any time at foursquare.com/settings (click "Save Changes" when you're done).