If you have xfire ingame enabled for your game, then you can take a screenshot of the
game by pressing Scroll Lock and S at the same time (ScrLk + S)
To upload a screenshot: (with the default xfire skin)
1) Open up your xfire window (the one that shows your friends and stuff).
2) Click on the tab that has a camera on the left side.
3) In the "Local Screenshots" area, you will see a list of the screenshots that you have taken.
4) Right click on the screenshot you would like to upload.
5) Click on "Upload Screenshot".
6) Then double click on the screenshot in the "Remote Screenshots" area.
7) It should open up a new browser window with your screenshot displayed on xfire.com.
8) To Share the photo on a forum or other html supported site, highlight and copy the
code in the "embed" box under the photo.
9) Paste it where you want it and it should work perfectly.