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No you can't - unless you make arrangements with Chris, the forum owner. The only place that you can list your website is to put it in your signature line. If you do that, it will show up on every post you make. You can't direct people to it with comments like "check out my signature for new products" but you can change it as often as you like.
Question. I haven't set up my website yet, but I will be after the new year-selling my knives. (Great North Blades) Can I put a link in the 'Forum Shopping Mall', when I'm set up? Thanks, Gary McMurtrie