Instructions
Click "Party" from the Menu. Click "Create" and type a name for your party. Enter a number that represents the maximum size of your party and click "OK."
Invite your friends to come to the same area that your character is in. Click their character and click "Join Party." Alternatively, once in your general area, they can click "Party" and select your Party Name from the list of available parties. They can then click "Join" to enter your group.
Enter a dungeon by gathering your party in a waiting area of your choosing outside of the dungeon. Once all members have joined and are waiting together, the party leader must lead the way into the dungeon. The group will automatically follow.