Hmm. you should look on your keyboard for something with " prt sc "
do you use a laptop? On mine have to use two buttons with "fn" in a box and press prt sc inorder for it to take the picture.
You'll know you have taken the picture if your screen froze for 1-2 seconds.
When you ook the picture, go to paint , go to file? and paste it to the paint board and save it.
To take better pictures in game use alt + u to take out the extra stuff on the screen and press alt + u to get it back to normal.
let me know if it worked
Yea i still don't see a prt sc botten but i'll look for it and i'll let you know as soon as the sever is back up and i'm useing a computer with keyboard