The library may - or may not - set up the loan so you can check it in
early. If they did, then you can see an option to return the ebook early
listed in the Item Info for the ebook. In Library view, click on the small
arrow next to the ebook name, and a drop-down box will appear. Pick "Item
Info" fron the list and you'll see the option. If the library did not set
up an early return, don't worry about it: the ebook will expire at the end
of the loan period and you will see the title, but won't be able to open it
after that date.
Hope this helps!