The link you pasted into your post was from your "My eBay" listing. When anyone clicks on it the eBay system looks for a cookie on the machine making the request and uses the information stored there. So if I click I get my "My eBay" page and if you click it you get your "My eBay" page. What you should do next time is go to the eBay Search page and click on the "By Seller" tab and enter your eBay id in the search field and click the "Search" button. Then copy the address when you auctions come up and paste it as the link and you will be in business. If this isn't clear, don't hesitate to ask me to try to explain it again.

Good luck on your sales.

Chas