- In the app: Find the message that bothers you, tap the three vertical lines in the top right corner of the message, and tap “Block this user” in iOS or “Block user” on Android. - On the web: When you are in a message with a person that is bothering you, find the three horizontal dots above their profile picture and click them. Find the “Block Member” option, and you are done. Blocking them deletes the conversations you had and stops them from contacting you again.