Adding small icons to categories

Hello friends!

I’m first time creating E-shop and I have 0 knowledge about programming. Could some-one tell me, how to add small animal icons next to the categories in website? So that people would see small pictures by pressing on button of “sunims”, “katems” and so on? ??

I’m using open-shop theme!

The page I need help with: [log in to see the link]