Zurich City Guide

We visited Zurich on 7th November and through this app we came to know about this tour, we reached at 12 and since contact details were mentioned we inquired about the details on our way.we bought the tickets and boarded a 2 hr city tour which was really nice. The bus drives you through all important spots and also allows you to get down and click pics at few spots.they have many mini excursion options including heidiland , Black Forest and rhine falls

I and my wife would like to participate in the Old Town Walking Tour tomorrow, Sunday September 29, at 11:00 a.m., in English. Do we need to register, or just arrive for the tour? Where exactly is the meeting place?