In the Item Description Section, there is a drop down menu for UserLinks. Click on that. Then click on Visit My eBay Store. Make sure you put your cursor in the spot of your listing where you want the link BEFORE you click on Visit My eBay Store. Also, check the Font and Font Size and anything else (like Bold or Italic) you want before you click. See my listing for an example: eBay Item
Hope that helps.
Cascade Coin & Collectibles
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