Just adding single images in to contents is very easy. I know how to do. The result is that the big single image will stand there to the left. This is not what I exect. I expect a small image to display inline in front of title. Same when you add images to categories to display in menu.

The title i mean is the title in your menu list of your theme elements. Insert menu list you will see title box where you can add your menu name. And from there how can i add an image in front of it. This is what I mean.