If you are logged out of your Cashrewards account and have forgotten your password, click the forgot password link and follow the prompts to reset your password. 

You can change your password while logged in here, or navigate to Settings > Security > Update Password . Please enter your new password in both bars, and click ‘Save new password’. You will receive a verification code to your mobile to authorise the change. 

You must have 
two-factor authentication
 enabled to change your password.