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Step 1: Hold ALT and press the PrintScreen button.
Step 2: Open up Paint
Step 3: Hold CTRL and press V
Step 4: Crop to fit
Step 5: Save as .PNG
Step 6: Profit
You'll have to save the image and upload it to a photo hosting website, such as Photobucket or ImageShack. After uploading them, you use the Image Code link that looks like this:
(IMG)stuff(/IMG)
(URL=stuff)(IMG)more stuff(/IMG)(/URL)
*The () are actually [], but I had to change them for this post.