Look below in the gray section - under Resources, there is another link that says "eBay Link Generator".
Here is the link: https://www.tradingcarddb.com/eBayLinkGenerator.cfm
Once on that page, there is a spot for you to enter in ONLY the ebay item number. Copy/paste that in from ebay, click the Generate button, and the link will display. Copy that, and paste into your forum posts.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).