if you already defined an apply method by filter hook job_bm_filters_apply_method() you can display HTML for these method by filter hook job_bm_filters_apply_method_html() as following.
function job_bm_am_apply_methods_new($apply_method_html){
$apply_method_html_new['new'] = 'Custom HTML Here for New Method';
return array_merge($apply_method_html,$apply_method_html_new);
}
add_filter('job_bm_filters_apply_method_html','job_bm_am_apply_methods_new');
