What does one need to do to join such a journey? The ship look gorgeous!!

@Raphi Unless you're an experienced tall ship sailor and in a position to apply to become one of the permanent crew, you need to sign up as "voyage crew" and pay the substantial fee. It was the most I've ever paid for a trip lasting a few weeks, but so worth it.Here is the sailing schedule https://www.barkeuropa.com/en/our-voyages/sailing-schedule

@Raphi Operating a ship of this kind has high costs. The voyage crew fees pay most of the bills.