1) Use XChat to send a message to:
       Address:     XDzTA6xMsx1FJkitgKaj3S9mMvPQEzN4w9
       Public key:  eRyb6fBBZxfkVp1kLcgc81WQuZw8pgpPwkVfKNhJBHBC

      (If you don't have XChat yet, download it here.)

2) Post the address you sent the message from onto the Official XC Forum here.

3) Put your XChat address and public key into your Bitcointalk signature.