Choose Arena from the Lobby
Arena is separate from Survival. Use its menus or /duel <player>, /queue, /party, /spec, /leave and /kiteditor for the corresponding interfaces.
Ranked or Unranked
Direct duels and matchmaking have a Ranked/Unranked toggle. Check it before starting: ranked results affect Elo; unranked results do not. Party duels are unranked.
Kit and mode availability depends on current arenas and configuration. The website kit explorer helps you discover styles; the live game determines which queues are available.