Now that my ebook is already uploaded and in my shop, I cannot locate within my seller admin where I can go to add the PDF stamper [I see where you enter it in Add New Product but I don't know where to go now that my product is aready uploaded].
Just click View/Edit/Delete Products, select the relevant product and click Edit. From there, you can alter the product's settings, such as setting up PDF Stamping as explained here:http://www.e-junkie.com/ej/selling-ebooks.htmWhenever you change a product's settings, remember to click Next until you can Submit the changes.
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