narrow search results

the website is https://www.ehunt.com.au
i have tried widgets, taxonomies, search.
i did manage to get it to work but it will not work within a category.
your demo works just the way i want it to work as it narrows down a search within a category. Could you please guide me on how to create this narrow search result feature. a video tutorial outlining the steps would be great.
can i send the login details via personal email. i don’t want to post the details here otherwise people will see my login details.
my email is zacca73@bigpond.com