[Orpheus]

You can change your screen name six months after you open an account, and six months after every name change thereafter. Your old name will be permanently unavailable to anyone, including yourself, so pick a good one.

I don't recall the exact name of the link, but it's instant and automated (no Cursedtomer Service involvement) from your "My Account" page (accessible from your PartyPoker client if you are logged in (the easiest/best way), or indirectly from Partypoker website main page.

Be aware that your *original* (first) screen name remains your account name forever (unless you make a special request to Party Poker Customer Support) so you can use either your first or current screen name to log into your client to play poker. (This is slightly lax on the security front IMHO, but I'm picky: Long ago, I helped set the Federal HIPAA standards for computerized medical records -- and I'm pretty unhappy with how those turned out.)

While you're at it, you might want to change your acct PIN (initially set to your phone number -- which is Aces-full-losing-to-quads sucky, from a security POV)