DOES ANYONE KNOW HOW TO TAME A COCKATOO?

I BOUGHT A CITRON CRESTED COCKATOO FROM SOMEONE WHO I THINK WAS AN ANIMAL FLIPPER. I SAVED FOR WEEKS TO GET THIS BIRD AND WHEN I FINALLY GET IT HOME IT IS TERRIFIED OF ME. IT BIT ME REALLY HARD WHEN I WAS JUST GIVING IT WATER. THE GIRL SAID IT WAS A 5 YEAR OLD MALE. WHAT SHOULD I DO?