Board Thread:General Discussion and Questions/@comment-5.66.218.36-20160105191108/@comment-24668482-20160117142329

Tap on the quest.Then press accept so that the blue arrow hints appear. Only do the actions that the blue arrow tells you to. If no blue arrow appears, go back into the quest and try again.

If following the blue arrows doesn't solve the problem, then take a screen grab and send itto the game developers with your complaint.