Don't worry, it happens to the best of us!
App
Click on the Forgot Password? link from the app's home screen.
Web
Go to the Home Page and click on the Forgot? link. Enter the email address for your account and you'll be sent instructions on how to reset your password.
More often than not, it isn't the password that users forget, but rather the original email address used to sign up. If you are having trouble with your password, try a different email address first. You may have signed up with a different one and just forgot.
If all else fails, shoot us an email at support@btwb.com and we'll get you sorted.