-Warned , if u gonna post any mean comments , this is for the people who needs help on this.-
1. If you want to take a screenshot. Might as well do print screen.
If you want to do print screen. Look at you're keyboard, next to the F12 key, you can see 3 keys.
And one of them is print screen. While your in game, click the button.
2. Then go to paint , and do " ctrl-v "
3. When you do that , you will see the screen. Then click the button
Below the Image

4. And circle the picture or image part u needed.
5. Then go to "http://www.imageshack.us/"
6. Browse the image, and click " start uploading "
7. Look at the direct link.
8. Then u put it like this ,

9. Then u will get a picture when u post the thread/post.
Example Image :

If u need more help please post.