You can now sign in (and sign up) - with your GitHub or Google account on CloudBees.
If you are new, or want a new account, just click on one of the buttons you will see around - Google and GitHub will then if it is ok to share some information - and then, you are done!
The same buttons also sign you on if you already have an account created that is based on Google or GitHub.
Everyone has a GitHub account, right? Or at least a Google account?
In any case, you can always signup the usual way.