You'll be asked to log in. You must use your UD ID number NOT your username. The first time you do this, you must put your ID number in and click "Set/Reset password" because there is no default password. This will email you a link, and you set up a password like many other websites/apps. Set your password to something you will remember like your UD password. Then log in. If it's not your first time, log in using your ID Number and password.
Once logged in, click on My Account under the Library Links pull-down menu.
From there you can see the items you have checked out, their due dates, as well as renew items that are due soon.