Julie,
To post an image in 
Discussions, create a
Screen Shot of the image you wish to post.
Upload the image to an online storage facility, like one of these linked to below.
Flickr
ImageShack
PhotoBucket
PICVAULT
Twango
Then use
HTML formatting, to insert the
URL of the location.
Use this format
<img src="Insert URL Here">
Post the resulting line of text.
Keep the images
small, and unobtrusive, when possible.
If the image is large, you can use this format:
<a href="Insert URL Here"target="_blank"><img src="Insert Same URL Here" width="Insert Desired Size Here"></a>
Desired Size is a number, dependent on the size to be displayed in the post, such as 20, 50, 200, etc. You can experiment with that number.
Below that type "Click to View Full Size".
The image will appear in the post at the size you selected, but when clicked, will open full screen.
You can also just post a Link/URL, to the image location, using this format:
<a href="Insert URL Here">Type Title Here</a>
You can also insert the
URL between
!
(Exclamation Marks).
Or use
Skitch.
Quoted from the
Skitch website:
"Skitch.com is a webservice that works hand in hand with our application Skitch to give you 1-click uploading of images for fast and fun image sharing.
ali b