Easy way to add Category Icons
The easiest way that I found is:
1- upload icons in your media library ( best size is 30X30)
2- Download and activate Plugin "reveal ID's"
3- go to "Ad Categories" and see the ID number on each category.
4- go to style.css (regardless child theme or not) and at the bottom past the following code
/*Category Name */
#directory .catcol ul li.maincat.cat-item-xxx { width:100%; background:transparent url(your png icon address) no-repeat scroll 0px 0px; line-height:38px; padding: 0px 30px 0px; font-size:12px; }
All highlighted fields:
1- category name
2- category ID
3- icon address in your media library
good luck