After you've successfully created a Lagunita account and registered your email address, you will see a message on your Lagunita Dashboard prompting you to check your email account's inbox for an activation link.
Once you receive the activation link, click on it to activate your account. If you don't see it in your inbox, check your spam, junk and trash folders.
You can also add firstname.lastname@example.org to your email address book, to ensure all messages sent from the course website successfully reach you.
If you do not activate your Lagunita account, once you log out of your current session, you will not be able to log back in until the account is activated.