How can I edit or remove one of my artworks
Method 1. Click my gallery at the top of the page. You can manage all your artworks from there. On the far right of each entry you'll find the options to publish/unpublish and edit the entry. Click edit to change the details of the entry. You can only delete and artwork if it is not published.
Method 2. Browse to your artwork in the gallery. Scroll down to below the big image and locate the options box on the right. There you'll find an edit item link, if the artwork is in fact yours of course.