Thanks for the report about the problem with the red text saying
that the username was not available even if it was actually
available (submitting the form will have worked to finish the
account registration but it is likely most people will try to pick
another username until it said available). The issue is fixed now.
If you did created a password based account on p2pu you can add
your openid at http://p2pu.org/en/profile/edit/openids/
If not, you can try again to create an account with openid.
licensing from that page was fixed as well.