This doesn't work

I am trying to use the following snippet, but the hooks I think have changed, looked on the hooks API but not sure how to implement. This snippet is found here. What do I need to change?

add_filter('tc_fp_block_display', 'content_before_fp');
function content_before_fp($html) {
$before_fp = ''; //Put your HTML inside this var
return $before_fp.$html;
}