How to remove just another wordpress site on tab?

Have you had any luck yet? I have the same problem. I know how to remove the tagline, however it doesn't go away from the browser tab. Im a complete noob so pardon me ladies and gents if there is a forum for this already, but i seem to be finding everything else but how to remove it from the browser tab.

Once you have logged in and the dashboard opens up, go to the settings tab and click on the "General" option from the drop down menu. As a result, the general settings will open up. Over there, go to the tag line field.