- Go to Products in your store admin and select the product you want to add this thumbnail to and click "edit"
- Now in the description area, where you want the thumbnail to go, click the Insert Image button which looks like a little picture frame.
- Click Upload, and select your image and click Load Image.
- Copy the URL from the Image URL field and save this to your clipboard for use later.
- Then in the Appearance tab of that, next to dimensions, fill in ONE of the dimensions fields for how wide you want your thumbnail to be. (150 px is good)
- Now click "Insert", and then "OK".
- Now click on the image you just inserted and click the hyperlink button (looks like a chain link).
- Click on the Popup tab
- Check the box for Javascript popup.
- In the Popup URL field, paste the image URL you copied from when you uploaded your image.
- I advise checking the boxes for Make Window Resizable.
- Then click Insert and OK.
- Then save your product.
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