Go to https://googlecloud.qwiklabs.com
Click Join in the upper right of the page.
If you have already clicked Sign In, look for the Create Account button at the bottom of the sign-in page.
Complete the form to create an account. Be sure to use the same email that you used to register for class.
Once you submit the form, if you get an error saying that the email address has already been taken, go to the bottom of the page and choose Sign In Instead. On the sign-in page, there is an option to recover your password if you have forgotten it.
Go to your email account. Verify your email address by responding to the email that Qwiklabs sends. This should only take a minute or two.
Follow these instructions to complete your login.