(...speaking on behalf of XP) Rather than trying to post it all in here, there is a TON of info in the Tech Support area about screenshots, programs to use & the conversion of those pics, you just to search through them all.
Basically, you have an image file that is called a "TGA" file...it is easily opened & converted with PSP & even a couple of other programs so you can convert it to "JPG" or even "GIF".
You will then have to upload them to either ImageShack or another site for them to store it for you. Once you do that, they will provide you with a link to post it here in the forums.
*
Mad REMINDER* ALL picture posts fall under our guidlines for
RULES Section 1 &
MEDIA POSTS