To start the registration, click on the "Register" button on the Ticketcenter´s start page.
Further function you can read in the FAQ: WOA Festival GmbH Knowledge Base - Ticketcenter (wacken.com)
Register your Wacken.ID
In order to register with the Wacken Ticketcenter, you need a Wacken.ID. With the Wacken.ID you can log in to various sites, including the Wacken Ticketcenter.