"Search for information about Miraak" is an objective in the quest "Dragonborn" in Skyrim: Dragonborn.
Walkthrough[edit]
Talk to Adril Arano at the docks in Raven Rock
Adril should have come to you after you arrived on the Northern Maiden
Watch the dialog option and keep choosing any option that mention Miraak
He will tell you that Miraak has something to do with Earth Stone and that you should investigate the shrine