Logging in: When you first open Castbox, the app will ask you to log in via Gmail, Facebook, Twitter, or choose to login later. If you choose to login later, go to the “Personal” page, and tap the “LOG IN” button to return to the login page.

Logging out: go to "Personal" - "Settings", and select "Log Out".

Benefits of login

After logging in, your subscriptions, listening history, playlist and favorites could be saved safely and synced across devices if you log in with the same method.