I tried to register through Facebook, but was unable to do so. Could it be that I did not provide my email address and if so how do I change that.
That’s probably it. You can register an email address with Facebook and try again. Alternately, you can use our first login option and create an account with Persona, a service designed to allow you to sign into sites without e.g. Facebook knowing what sites you’ve been visiting.
Thanks for your interest in the Materials Project.