"Cannot modify header information.." Warning

I altered the footer information and now I cannot edit the site. Everytime I try I get the following warnings.

Warning: Cannot modify header information – headers already sent by (output started at /homepages/40/d332826545/htdocs/beta/wordpress/wp-content/themes/customizr-child/functions.php:2) in /homepages/40/d332826545/htdocs/beta/wordpress/wp-admin/post.php on line 222

Warning: Cannot modify header information – headers already sent by (output started at /homepages/40/d332826545/htdocs/beta/wordpress/wp-content/themes/customizr-child/functions.php:2) in /homepages/40/d332826545/htdocs/beta/wordpress/wp-includes/pluggable.php on line 899

I am a complete novice and I have no idea what I’ve done wrong. Please help.

I apologize in advance if I’m omitting pertinent information.