Hi,
The filters can be created via the Display>Filters.
They should appear directly at the top of your products listings without doing anything else.
However, if you configured some restrictions in the filters, like limiting them based on the category, or if you turned off the display setting for filters under the Products options tab of your products listing menu items, then they won't be displayed. So check these.
Also, you can display the filters on the frontend in a module position of your template with an instance of the HikaShop Filters module, via the Joomla modules manager.