First, try using the MAC address (all in UPPER CASE) of your whitebox unit (it's on a sticker, and on the box it came in). If that doesn't work, click on the "Forgotten Password" link and follow the instructions to reset your password.
Please don't contact Sam Knows about this, as the team in this Forum have promised them we'll resolve password issues!
The URL for Sam Knows reporting is:
https://reporting.samknows.com
Your Email address is your login name.