While we tried to create these resources as open as possible it is a requirement to get an account before you can take the quizzes or receive certificates. When you hit your first quiz it will direct you to get an account. You then land on a page where you can request an account.
Once you enter your info you will need to check your email inbox and most likely junk folder for the email to respond. Once you approve your account you can return here and look for this box on the left side bar.
Voila! You are now a full user. Sorry for the extra steps.