Complete a Dungeon that gave you a Tavern. You can read up on the Tavern in the extended operating guide for FF:CC:MLaK. In case you still need it anyway, each tavern allow you to customize one party, upto 3, and characters going to the same dungeon will attempt to form a party automatically based on how close the levels are between the members.
I am a PC gamer, and also have a NDS now, but without access to a Nintendo Wii until End of 2007.
Currently playing: Super Smash Brothers Brawl(Wii), Mystery Dungeon: Shiren the Wanderer(DS), Dragon Quest Heroes: Rocket Slime (DS), WiiFit(Wii)
Games Recently Beaten: Final Fantasy Crystal Chronicles: My Life as a King (Normal; Very Hard after the next DLCs become available)
1 word: RTFA