Tribes are very complex or can be also simple at times. It depends on how good you are of a leader and how good you are at the game. It also depends on who you choose to be in your tribe. Tribes in Survival 303 are the main part of the game. Without a tribe, things may be hard unless you are good at being solo or you have great weapons.
Now, to invite players to your tribe you must click on "Player Name Here" box. In this box, you have to type in the players Gamer Tag or Name in order for them to get an invite to your tribe. If they join, you can give them a job by clicking in the box "Job Name Here" and naming the job you would want to give them. Example; Farmer.