1) Register an account, activate, don't vote.
2) Be logged in, don't vote.
3) Close the window w/o logging out.
4) Click on the link we've provided. You will be on P&B's voting screen and still logged in. Vote.
5) Don't do any of the sharing it suggests you do after you vote. To spread the word, share the link we've provided.
I know that works. I suspect one could also register and so forth from the link we've provided but I'm not sure, so just do the above for now as it absolutely works.