Find the sentence that reads "Registered members pick up your Backpack", and click on the word "Backpack". Or, click on the green "Backpack" button at the bottom of the page. (Both lead to the same place.)
ENT will prompt you for your user name and password.
When the contents of your backpack appear on the screen, click the "Designs" link.
Your Design List will load, and you'll see the titles of designs you are working on. Among them, you should see the design you're looking to access.
Click the design name to resume work on this design in the CCDT.
If you're taking a WIDE course, and you want to access your designs from the WIDE site: