It's as straight-forward as PMing me your desired Editor username, password and your currently active email address.
I would however advise that you
read through this post I made a short while back. And be absolutely certain it's something that you're interested in. Something I'd like to highlight from what I wrote:
"Without naming names, I've had writers in the past who write a single article, lose interest after that, and I never see any more contributions after that. Obviously, to spare any embarrassing back-and-forth PMs whereby I take the job off you and give it to somebody else, please be absolutely certain that this is for you."