category drop down is not including in search results

Hi,

I have a website of my client on which I have added the category drop down list below the search text box. But on clicking search it is not considering the drop down list’s selection.

The website is https://www.freepressreleaselist.com/

Please help me how I can bring the categories from the database in a drop down list and be able to considered for the searches.

Thanks
Mayank