Your member account is created when you register for Otakon.
Visit https://www.otakon.com/register/ any time registration is open (registration typically opens around February/March).
New for 2018: We are using a new registration provider, ShowClix. You can view your registration, print your confirmation and more directly from their website: https://www.showclix.com/my-tickets/
If you have registered, you can log into our Member's Only section of our website here: https://www.otakon.com/members/login/