How to play old tutorial & launch main Molag Bal quest

Rinmaethodain

https://www.youtube.com/watch?v=cv1oqeMVg1g&feature=youtu.be

You go to Wailing Prison (old tutorial) as a part of separate quest. Its picked in first significant zones (Auridon, Stonefalls, Glenumbra) and its name is "Soul Shriven in Coldharbour".