Thank you
I installed Category Icons and I managed to display the icons in the sidebar (I think the column on the right is actually called sidebar in wordpress) but I can’t see the icons when I’m in the category page or in a post page
Do you actually use the same plug-in?
Sorry for my delayed reply. No I’ve never used any of the category icons plugins as I’ve not had a need for them before.
If I was you I would try some of the other plugins until you find one that does what you need, or if you’re comfortable with the code you could try making your own plugin solution like this similar question:
http://wordpress.org/support/topic/how-to-add-icon-to-a-specific-category-posts?replies=3