Not index.php as blog site

I would like to integrate wp in my fansite, as the site where I post the news… When I installed it and were asked for my blog site, I put the url of the site. and then news.php
Now, when I try to login, I get this:
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 125
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 129
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 132
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 134
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 135
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 136
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 137
Warning: Cannot modify header information – headers already sent by (output started at /web/www/frac/users/jondt/wp-config.php:54) in /web/www/frac/users/jondt/b2login.php on line 157