Make code required

Hi Greg Winiarski,

Im not able to make this code required.
Can you help please?

foreach($form["field"] as $k => $field) {
        if($field["name"] == "adverts_location") {
            $field["type"] = "adverts_field_select";
            $field["max_choices"] = 1;
            $field["empty_option"] = 1;
            $field["empty_option_text"] = "Select State...";
//keeps going...

Cheers.

https://ww.wp.xz.cn/plugins/wpadverts/