Halo 3 online? Matchmaking...?

[jairo.fuentes]

ok so me and my brother are trying to play halo 3 online with people. where do i go to join a game??
i have x box live but i dont know how to find any open matches.
i just want to join not lead...

 

[dilliontrain]

Matchmaking, Social or Ranked or other. Need xboxlive.

 

[minder92]

switch ur lobby from w/e ur in to matchmaking

 

[Thomas G]

omg... i love halo 3 matchmaking...