This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Can you explain what you lost, exactly? Maybe you mean you forgot how to log into this account from some other machine, but you remain logged in here? And by "credentials" do you mean log-in name, password, or both?