Your eTextbooks will be displayed in your moodle course on the left hand sidebar. You need to click on the book to set up your account, enter your details and agree to the account terms.
Licences mean that the books must only be accessed by the staff/students on the module (this may mean they are not on the module you would assume but don’t be tempted to move them).
Make sure you click on each book to download. You need to download to keep the book.