After an account is created for you, you should receive an email as follows:
Note that in the above example, the username is sd1105_2020_s2_w_stu00, while the email address of the user is mccliff@polyu.edu.hk. You should be receiving an email with your own username.
As your email client may consider the domain @designandmake.org as coming from a spammer, it may put the email in the junk folder. Hence, please try to look for this email in your junk folder in case you cannot find any in the Inbox folder.
Once you find the email, you can visit the server by clicking onto the button with the message Click here to get started!, and you will find the following page:
After entering your new password, you should see the following page:
You can then click on the log in link to visit the login page as follows:
After entering the correct username and password, you should see the following screen, which means that you successfully entered into the Confluence server.