Inside a livestream, you can tap on the username to go to their profile. On their profile page, tap the three-dots on the upper-right corner. Select settings and scroll down to see options to block the user.
Only the host and moderators of the livestream can mute a user. If you wish to mute a kumuzen on your livestream, just tap on their username. Their profile will pop-up and options to “kick” “mute” and “block” will appear. Tap on the options to complete the action.
Please remember that once you kick a user in your stream, there will be a 5 minute hold time before that user can go back to your stream again.