In Anvil, next to the Chapel. Talk to the priest outside.
go to anvil church and across from the entrance is an old man... talk to him
The only way to get rid of infamy is to visit the wayshrines on the Pilgrimage quest, which is the first part of the Knights of the Nine plugin.
Speak to the Prophet. He is preaching in front of the church of Akatosh.
the extra disc is for the add ons (shivering isles and knights of the nine) install it and you get two more main quest lines.
Steam has it, with Knights of the Nine also.
During the course of the KOTN quest, you do get a small stronghold which acts as a base for the new Knights of the Nine order. It does not add any other obtainable buildings though.
You get the armor by completing the quests in the Knights of the Nine official plug-in.
You must either buy it from the live marketplace or buy the game of the year edition which includes Shivering Isles and Knights of the nine
You have to find a character in the game , who will activate the Quest. No spoilers here, sorry.
You can start the Shivering Isles questline by going to the island in the middle of the Niben Bay. The Knights of the Nine can be started by going to Anvil and speaking to the Prophet.
if it is the knights of the nine or shivering isles the disk is only meant for PC
You dont get anything but a whole new storyline and a new spell. The storyline is the Knights of the Nine storyline.