As a chat room owner (someone who can update room settings, add members, and deactivate the room), you can make a room member an owner or remove them as an owner. To promote or demote a room member, use Chat Details. Click the i in the top right of your chat and go to the Members section.
Click View members list to expand the list and hover over the person you want to update. Click … to promote, demote, or remove the member from chat.