Your username when logging into your ProctorU exam from the Always Food Safe website is the email address you used to create your account with Always Food Safe. You should never log into ProctorU directly. You should always log into Always Food Safe at www.alwaysfoodsafe.com/learn and click "Schedule or Begin Your Remotely Proctored Exam" which will take you to ProctorU.
If you require any more assistance, please contact us at help@alwaysfoodsafe.com