Cant get in – i dont exist…

I did:
put a countercode in the head on my site(in htlm): gfsrn.info and now i cant get in to wordpress to remove the code
After i put the code into my site and try to log in, i just see this – and cant go into my site to redigere:

i saw this on https://gfsrn.info:

-?￥???|
Warning: Cannot modify header information – headers already sent by (output started at /home/gfsrn/public_html/wp-content/themes/atahualpa/functions/bfa_header_config.php:1) in /home/gfsrn/public_html/wp-includes/pluggable.php on line 865

I expected:
to get into my site and remove the code, and the site is ok again…but nothing happend…

What do i do? Please dont tell me that i have to do all the stuff again?