Help I Need Help!! Major Help Bothering Me Alot!!

I know how to take a screenshot but when I save it it also saves all the blank part and when I host it it is small and theres still white part how do i get the picture only only the picture not the blank parts!

use www.imageshack.us
when uve hosted go to my images and use the top code its much better

ok i will try it!

has it worked now