Here, just a sec...
Fn is at the very bottom left corner. You push it down while pushing "prt sc" and then you open the paint program.
When you open the paint program, click Edit, then Paste. vv
When you do, you should come up with what you just copied. When you push print screen, it just copies whatever that is on your screen at the moment.
Save it on your desktop, and then go on photobucket or whatever.