Only Circle owner can appoint moderators.
Since appointing moderators can reduce the load of managing Circle, try appointing moderators!
You can remove moderators any time through the settings.
■Appoint as a moderator (for iOS/Android)
- Tap [︙] at the top right of Circle screen
- Tap [Circle details]
- Tap [Add moderators]
- Select the member, tap [Done]
- Tap [OK] to complete the process
■Remove as a moderator (For iOS and Android)
- Tap [Circle details] at the top right of Circle screen
- Tap the moderator and tap [Remove from moderators]
Please refer to the articles below