You can have links in your Auctiva sig, but not sure about the store..I would ask them to be sure...because when someone clicks on your Auctiva store it takes them to Ebay and you can't have any links to other selling venues on Ebay. Strictly prohibited. Most of us aren't even sure about having BigCrumbs links on our ME page..I know some sellers have had their pages taken down because of that.