There are two ways - through the Delaware Libraries - OverDrive website or the Libby app on a mobile device. You'll need to login to your library account with your library card number in order to renew your digital materials. Click on the little books icon to view your loans. When the Renew option is available for eMaterial you have checked out, you'll see a Renew button under the item. Simply click on it to renew the item. You can also manage your eMaterials through the Libby app, if you have it on your mobile device.
You may want to see OverDrive's help page for steps on how to renew an eBook for further information.
If you have any trouble, please contact your Delaware library staff for help - we're happy to assist!