How to post photos...
To share your pictures on these forums, you need to do the following:
1) First set up a photo-hosting account. These are usually free of
charge and some of the options include flickr.com and photobucket.com
2) Upload your pictures to that hosting account. Most will then make it very easy to copy the URL of any particular picture.
3) Click the little picture of a tree above the comment box in the C&SC forums.
4) Insert the URL of your picture in the required field and click "insert".
5) Er, that's it (in theory).