Need to add Houz under social media profiles section

i would do that with an image of houzz and a small snippet in child-theme functions.php:

function avia_add_houzz_social_icon($icons) {
    $icons['Houzz'] = 'houzz';
    return $icons;
}
add_filter('avf_social_icons_options','avia_add_houzz_social_icon', 10, 1);

you find this new entry than on “social profiles” at the end of the list.
for inserting now the new icon just place this to quick css:

#top #wrap_all .av-social-link-houzz a:before{
    content: "";
    width: 20px;
    height: 20px;
    display: inline-block;
    vertical-align: top;
    background: url(/wp-content/uploads/path-to-houzz.svg) no-repeat center center;
    background-size: contain;
}

#top #wrap_all .av-social-link-houzz:hover a {
  /***  optional ***/
}

now the values depends on where you will show your social media icons