I really want to try this, but I'm unable to register. At the page where it says "Create your free Docker ID to get started" after I click Sign Up, the page jus

I really want to try this, but I'm unable to register. At the page where it says "Create your free Docker ID to get started" after I click Sign Up, the page just refreshes and my chosen ID becomes blank with no indication of what's wrong. I've chosen several different IDs and neither of them worked. Browser is Firefox 45.0.1 on Windows 7.