Use the following steps to create a MyQuest account: 1 Go to MyQuest.QuestDiagnostics.com and click Create Account.. 2 Type a Username and Password, reenter your password, and then click Next.. 3 On the Tell us more about you page, complete all required fields and then click Next.. 4 On the Tell us how to stay in touch with you page, complete all required fields and then click Next..