How to select an alert tone for notifications from Reminders and Feeds?
To select an alert tone
1. Open the Bigin app on your iPhone.
2. Tap the More 
icon at the bottom right of the screen.
3. Select Settings 
.
Under "General", you can find the title "Notifications".
4. Tap on Notifications > Sound.
5. In the screen that opens, tap on the Alert Category dropdown
.
6. Select "By Type (Reminders & Feeds)".
Once you've selected the alert category, you can tap on either "Reminder" or "Feeds" under Alert Tone to set their respective alert tones from the list of available sounds.