I have an online PDF book available on my website. I take quotes from it and post them on my Facebook page, using Copy and Paste to insert the link from the site, which I created in Xara Web Designer Premium. How do I fix the graphic of the book's cover, which is on the download page, to appear on the Facebook link. In Wordpress this would be the 'featured image', but I don't know what the WDP equivalent is. Can you advise, please? I'm using Xara WD Premium latest version on a fast, modern Win 11 PC.