In BUTT, click Settings and open the Stream tab to fill in what players show about your station: a profile Name, Description, Genre and URL. Fields you leave empty use BUTT's defaults. Click Add when you are done.
The box in BUTT that asks for a public directory listing changes nothing on our servers. A listing in the SHOUTcast Directory is set up in your account instead: switch the station to SHOUTcast under Streaming server on its Overview, then add your authhash there. The Radio dashboard user guide explains both.