If you're using a newer version of the OverDrive app, you'll see several options for signing into the app the first time you open it. It's important to always sign into the app using the same method (you'll be asked to sign in again if you uninstall and reinstall the app, or install it on a new device). This is especially important if you download eBooks in the app, because if you download an eBook under one sign-in (or "authorization") method, you can't download it again under a different one.
The OverDrive account option
Signing in with an OverDrive account (using an email address) comes with lots of added benefits, like the ability to sign into (or "authorize") other installations of the OverDrive app and Adobe Digital Editions on a computer (so you can download the same eBooks in each place). Also, once you start adding libraries in the OverDrive app, you can use your OverDrive account to sign into any library that has switched to the new OverDrive.
To sign into the app with an OverDrive account, select Sign up or Sign in when the app first opens.
Then, enter your name (if prompted), email address, and password to sign in with (or create) your OverDrive account.
The Facebook option
The Facebook option comes with all of the benefits of a traditional OverDrive account, except that you can't use it to authorize Adobe Digital Editions to download eBooks on your computer.
To sign into the app with your Facebook account, select Sign up or Sign in when the app first opens.
Then, select Sign up using Facebook (or Sign in using Facebook).
The library card option
Note: The library card sign-in option is supported for most libraries, but not all. If your library isn't supported yet, please try a different sign-in option.
The library card option comes with some of the benefits of a traditional OverDrive account, except that you can't use it to authorize Adobe Digital Editions to download eBooks on your computer, and you can only use it to sign into one library in the OverDrive app (though you can still add other libraries in the app and sign into them using different library cards). However, since the library card option doesn't require a name or email address, it's a great choice for users under the age of 13.
To sign in with your library card, select Sign up or Sign in when the app first opens.
Then, select Sign up using library card (or Sign in using library card).
The under-13 or school option
The under-13 sign-in option is recommended for users under the age of 13 who can't sign in using their library card. This option might also be a good choice for students who use OverDrive in their classes, because they won't need to create a separate account to sign into the app.
You can only use the under-13 option to sign into one installation of the OverDrive app, which means you can't use it to download the same eBooks on multiple devices. Learn more about the under-13 option here.