If you are working on an OverDrive title. Please see the OverDrive Add New Book for instructions.
After you Upload or Sideload a title you can import it to open it up in your profile.
Select the title from the dropdown menu for Project
If you are importing a book from OverDrive, ensure "Use OverDrive Metadata" is selected
Select Import button
The title will start importing
Once it is imported you will be taken to the main project page. You can now start working on the project. To learn more about the different options go to Project Page: Renaming and Reordering Tracks