To mute another player, click on their username at the table and click the chat bubble. You should see an 'X' appear and that means they're actively being muted. If you want to unmute them, simply click the chat bubble again and the 'X' will disappear. This will not mute them on every table, only the table where the mute function has been enabled.
Now if you want to mute all players at the table, click on the chat bubble next to the speaker icon as shown below.
If you have muted them because they're being abusive, please remember to click the icon with an exclamation point near the chat bubble and fill out the required details. Our team reviews every report sent to us and we'll take action against their account if necessary.