buttons buy buyers buying cart code copy copy-paste cut demo download downloaded ebook html provided purchase tabs website

I am trying to put my ebook to be downloaded but I can't figure out how once I cut and paste the buy now and cart tabs, how does the person who is buying my ebook get the download?

You don't copy-paste the "tabs". You copy the HTML code provided, paste it in your website and then buyers use those buttons to make the purchase. Please see a demo at http://www.e-junkie.com/ej/demo.php.