Logging out of chat and refreshing your user can help address any issues related to your chat user, including user-name or admin rights issues.
To log out of chat, navigate to any chatbox, then click the little "power icon" near the bottom left corner, as shown below.
You know it was successful when you see your name disappear from the left column.
Logging Back In
To log back in, simply refresh the webpage as shown below by using Ctrl+R, CTRL+F5, (Windows), Command+Shift +R (Mac), or by clicking the refresh button near the top left of your browser window.