I am making a SC map and i dont know how dose triggers go for to play "Team free for all"
need help...

You can't, unfortunately.

what do you mean with "Team Free for all"?

If you mean that 2 players share their units and ressources and you play free for all against other teams, you can only do that in the game type.

Triggers will run only in UMS mode. You cannot use the team feature like in the game mode in UMS because you cannot enable that.

If you meant that, this is impossible.

Triggers are only checked in Use Map Settings mode.
Team FFA is another mode and there are no trigger available.

According to Polaris (one of the few who mods default triggers), FFA actually uses the same triggers as Melee. The rest is hardcoded, I suspect.