When you are given access to Enscape you will get an email to register. The link in the email might send you to a page to login. Do not try to login with your Queens login information. Instead you want to click on "create account".
You will then be directed to this page to create the account. Please use your actual Queens email address as the license for use of Enscape is tied to your Queens account. You will then need to create a username ( could just use your queens username ) and a 12 character password.
You then should be able to login to the Enscape extension within Sketchup