Create a teacher account by signing in to app.bookcreator.com/sign-in/teacher. You'll create your first library as soon as you start using the app.
This library will have an invite code which you can give to students. Next, students sign in using Clever. They can also sign in at app.bookcreator.com. They can use their district Google account to sign in.
Once students have signed in, they'll enter your library invite code and join your library.