http://fyu6cxqig7wcxkorx4qniyclvytdgdegyp7jbfq4le3pjqqmt76nl4yd.onion/howto
If you don't find your e-mail after 10-15 minutes from purchase, do check your spam folder. Of course, you won't be able to reply that mail (technically you will be, but since the sender will be faked, your reply will never arrive back to us).
18 similar results skipped