Please go to app "Settings" - "Notification Settings" - Select which kind of notifications you want to receive.

For Android users, you can set up E-mail notifications (Castbox newsletters) and Push notifications (Suggested content, Replies toyour comments, New episodes, App Badge) as shown in pic.1.

Also, you can go into "New episodes" and customize notifications of new episodes from your subscription as shown in pic.2.

For iOS users, you can set up E-mail notifications (Castbox newsletters) and Push notifications (Suggested content, New episodes).