1. Go to ImageShack. 2. Click on Browse and find the picture on your PC. 3. Once you selected the right finel, click on Upload Now. 4. When the image is uploaded, click on something like See image full-scale. 5. Copy/paste the URL of your image here and use the URL tags.
To add to what Andrea said, if you don't have an account with ImageShack (and it's free to get one), make sure to save the image's URL somewhere in case you want to use it again. Sure, you can upload it again, but if you keep the URL, you won't have to bother with that.
"If winning a debate is based on whoever gets in the last word rather than on who best articulated and defended their point of view, then I guess you won. Congratulations."
No new users can't, because of the pornbots, which I am sure the the SHPers that access the board from work appreciate. That is why I suggested the use of an image host.