(Applies to: all versions of FusionBB)
To retrieve a temporary password if you've forgotten yours, at the login pop up, click on the link I forgot my password!
This will take you to a page where you will need to input either your username OR
your email address, then click the Proceed
button. A temporary password will be sent to your 'real email' address.
After you've logged in using the temporary password, you can reset your password in your Control Panel.