sampbfa on "Can't login and cannot modify header information?"

I incorrectly added a line of code to the end of the style.css in an attempt to change a font colour.

Now when I cannot login at http://www.playbeautifulfootball.com.au/wp-admin/ I get this error:

body, button, input, select, textarea { color: #FFFFFF; }
Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-content/plugins/facebook-members/facebook-members.php:321) in /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-includes/pluggable.php on line 881

Now when i login at i get this error:

body, button, input, select, textarea { color: #FFFFFF; }
Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-content/plugins/facebook-members/facebook-members.php:321) in /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-login.php on line 368

Warning: Cannot modify header information - headers already sent by (output started at /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-content/plugins/facebook-members/facebook-members.php:321) in /hermes/bosoraweb125/b2336/ipg.playbeautifulfootbal/wp-login.php on line 380

I have tried removing the spaces on these lines in the pluggable.php file but it has made no difference. What can i do??