beginner question

I've been playing guild wars for a couple days. I started with factions then bought prophecies a few days later. Can someone help me out and briefly explain how I can get to the Prophecies continent from the factions continent.

Talk to Guardsman Chienpo in Kaineng Centre to recieve the quest "Chaos in Kryta".This will ultimately take your Canthan-born character to Lions Arch.

http://gw.gamewikis.org/wiki/Chaos_in_Kryta

NB: you must have both games and have the keys merged into the one account in order to do this.

To get to Tyria, to need to speak with the NPC Guardsman Chienpo.

He will give you the quest: Chaos in Kryta (Canthan-born characters only)

Do that quest and you will be taken to Kryta.