WooCommerce Banner Image

Hi, I wanted to change the header images which are displayed on the Category pages in WooCommerce shop, so I purchased the WooCommerce Banner Image plug-in. However, this just loads the banner image underneath the standard header image for the website. How can I customise the image at the top of each product category page? (On the individual product pages this is done and I get an image of the product in the header).Thanks!