Did you get the quest by entering the green area (Wildland) or by moving onto the quest location at the gate itself?
If it is the former, go to the quest location at the gate. This will start the quest proper and send you on a long and "hard" quest series (this is the Master Quest).
If it is the latter, clicking on the quest icon should reveal where to go. This doesn't always work. Mostly because the quest location is still hidden by the FoW. Try to look around some more and you should be able to reveal it.
