All members and hosts can block members from contacting them via chat.

Blocked members won't receive notifications. They'll see a message when they try to message you, explaining they can't.

To block a member, click on their profile and scroll down to Block this member. You can also block a member directly after attending a session together.

Blocked members appear on your blocked list, found in Your Profile > Blocked members, where you can manage them.

Related: flagging & reporting someone