Hello Rayhan and welcome to Halocustoms! I'm glad to see that you enjoy Halo so much and more to the fact, Customs!
If you'd like to join a game just click the "Customs" tab at the top of the screen and check out which games are going.
Aside from that if you have any questions about the site then just feel free to ask ^.^. Aside from that, happy gaming fine sir .