Form a party
Invite another character and have them accept the invitation. The Party window shows the group and its members. Use its Leave control to leave the party; the leader has additional party-management controls.
Find a group
Party Finder is a separate window for discovering or advertising parties. Filter by level, open slots or auto-join availability, then select a party to view its details. An empty list means there are no matching advertised parties.
Dungeons and travel
Some dungeon entrances require a party. Being in a party does not remove level, ticket, cooldown or portal requirements. Check the Travel Hub entry and the dungeon guide before travelling.