@Merry Andrew,
Step one: Navigate your browser to this site ...
http://www.imageshack.us/
Step two: Where it says "upload", you want to click on the "Browse" button.
Step three: Locate the scanned photo you saved on your computer.
Step four: Click "Start Upload" (You could get fancy and "resize" the photo at this point, but let's not go crazy just yet.)
Step five: When it's finished uploading, you should see a thumbnail image of your pic. What I do is
unclick the box under the pic so it does NOT "include details".
Step six: Select and "copy" the text in the "
Hotlink for forums (1)" box.
Step seven: "Paste" that text directly in an A2K thread.
Voila.