#for 1)
add_action('after_setup_theme','kleo_remove_actions');
function kleo_remove_actions()
{
        remove_action('wp_head', 'kleo_home_page_image', 9);
    #for 4)
    remove_action('kleo_bp_before_profile_name', 'kleo_bp_compatibility_match');
}
function render_user_search()
{
   return '';
}

#for 3)
add_filter('kleo_bp_profile_default_top_tab','my_default_tab');
function my_default_tab() {
    return 'looking-for';
}