Board Thread:Questions and Answers/@comment-75.70.109.136-20121212125340/@comment-75.118.119.204-20121215111543

To unlock higher ranked quests, you need to advance in Hunter Rank, which is achieved by doing quests in the city and gaining guild points. Every 9 or so levels, you unlock an urgent quest that, when completed, unlocks the next level, or star, of quests. Hope this helps.