Anyone can turn off replies on Remind if they use the app or web. If the other user turns them on repeatedly, you can block them.
To turn off replies in an existing conversation, tap the information icon in the top right of the conversation window. You should see a Turn off replies option on the right side.
If you're a teacher or administrator, you can turn off replies for all conversations from the Communication page in your Account Settings.
- App: Go to your account settings. On iOS, tap the person icon in the upper left on the Classes screen. On Android, tap the three dots in the upper right and select Settings.
- Web: Go to your account settings. There's a box you can check or uncheck that states "allow replies to your message" —you'll be asked if you want the change to affect both existing and new/future conversations.