Hey what's up man! Welcome to the community. HaloCustoms.com
If you have any questions feel free to ask me or any of the staff members! My name is NinetysBorn and I'm glad to have you here
go to upcoming games and look for a lobby you want to join, if you decided on one click on the giant green checker mark to RSVP (that tells the host you want to join). lastly when the lobby starts shoot the lobbyhost a message saying invite by clicking on the gamertag in the lobbythread (you will get redirected to xbox.com's message center and the gamertag of the host is automaticly inserted)