I run into some people using bugs and exploits to win battleground( on NA-pc server, yesterday / november 3th / 2018 ), i have the Screenshots and their names how do i report or to who does anyone can help me
That screenshot you posted shows a bug that cannot be done intentionally, you probably shouldn't report that player.
What causes that bug is being killed while simultaneously picking up the ball. This causes your character to pick up the ball AFTER you've died, which means when you respawns you'll still have the ball. It also won't deal damage to you while it is bugged like this. Obviously this player could have jumped down and made it fair for everyone, but simply choosing not to jump down from the spawn isn't an exploit.