[Plugin: Widget Context]Show a widget on products in a certain category

Using Woocommerce! I want to show a widget on all products in a certain category, not on the category page however. I added a text field in the “Product Post Sidebar” that is just an HTML img src to pull an image (if anyone know of an easier way to put an image in the sidebar, let me know), and the Widget Context text bar shows up, I just don’t know how to code it right. I want it to show up in the “Steel” category (slug= steel). Please help!