You can try to change CSS in google-buzz-er/css/google-buzz-er.css.php file, but changes will be lost after every Google Buzz Er plugin update.
What kind of control ?
If you want just to hide header you can do that with CSS, just add this line:
#gber_title { display: none }
Google Buzz logo is integrated in widget on two places. It should look like as on this screenshot http://s.wordpress.org/extend/plugins/google-buzz-er/screenshot-1.png?r=205455
