Easydiscuss Search by category filter

Hello,

I would like to use "populateCategoryFilter()" as select filter category instead of the original "input category text filter".

I have seen I have to do with $catFilters and $catLabel in input.php for getting my category selected (in populateCategoryFilter) as filter.

Do you have a quote to help me to achieve this? (please take a look to my screenshot)

Thank you for your help.