Go to "My Ebay" and click on one of your auctions. Then on the right side of the auction click on "See other items". Once you are on that page, copy the link in your address bar.

Next, go to TCB and create post. In the bottom of the post, paste that copied address into the "Optional Link URL:" box. Then type "Bill's Auctions" or whatever in the "Optional Link Title:" box. Preview, and post.

Hope this helps