custome search form

hello,
i’m looking for include this plugin for a real estate wordpress website.
it’s work very well, but i would like add more custom fields in search form. Form example, add “property type” , “area”, “price” and more..
I’m working with WP Property, did one have ever try this?
I’ve tried to put this :

<?php
the_widget( 'GeoMashupSearchWidget', array(
	'radius_list' => '10,50,100,300',
	'results_page_id' => 303,
) );
?>

in an other search form of wp property but doesnt work.
One can give me a way to continue this? Do you think it’s possible?
thanks

https://www.ads-software.com/plugins/geo-mashup/