Please visit Raptr's login page and select the "Forgot Password" option.

A second panel will appear below where you can enter your e-mail address. The e-mail address entered needs to be the e-mail address associated with your Raptr account or you will not receive an e-mail.

It will contain information and links to complete the password reset process. If you do not receive the email within 10 minutes, make sure to check your spam and bulk mail folders. 

If you are not receiving your password reset email, we'd advise e-mailing us at help@raptr.com or opening a support ticket: http://support.raptr.com/support/tickets/new