First, you need to download the Tor Browser to access the website.  Here's the link: https://www.torproject.org/download/download-easy.html.en

Next, you're going to want to go to this link in order to register your account, and then sign in.  
http://pwoah7foa6au2pul.onion/affiliate.php?aff=264987

Finally, buy some bitcoin here: https://www.coinbase.com/join/561a6d94c2ab303f8f000085

And then go SHOPPING!!  Happy using people!