the way someone would do it if they had no clue how would to follow these simple steps..
1.load halo
2. go to where you want to take the screenshot
3. take a screenshot in game by pressing the "print screen" button on your keyboard.
reference pic for print screen button:
4. after hitting the "print screen" button you exit halo and open microsoft paint.
5. when paint opens go to the top edit tab, let it drop down and choose "paste".
6. then to help us you want to go to the tab that says "image" and choose "strech/skew" input 50 into both and this should resize your pic automatically.
7. save the pic as a jpg.
8. you can upload the pic at
http://imageshack.us/
9. post the address/url to the pic here so we can view it.
OR.......
you can download fraps ->
http://www.fraps.com/
to upload pictures you can either...
get a photobucket account ->
http://photobucket.com/
use imageshack ->
http://imageshack.us/
use attachment feature when posting a reply -> go see the reply options.
philly beat me to posting this and for that i hate him..
nahh.. j/k