When you register an account, you should receive a welcome email soon after. Please follow the account activation link in this email before logging in for the first time.
If you can't find the activation email in your Inbox, please check your Spam/Junk folder.
If you have lost your activation email, you can ask for it to be re-sent. Please follow the instructions at “Resend activation link?” on the login page.
NB: This information does not apply if you have registered via Single Sign-On (SSO).