Err, you'll get there after finishing the 11 missions that preceeds it. (11, because you don't have to go down both the Kurzick and Luxon sides of the story.)
Unlike Prophecies...Cantha is full of locked gates, ect that force you to go through each mission/primary quest.
Go to guildwiki.org, type in a random Factions mission, and at the bottom of the screen you will see 13 missions in order of appearance ingame, unless you come from a other campaign that is