Here's a quick tutorial.
If you want to post pictures, DON'T use the "Quick Reply" box at the bottom of each thread ... use the "reply" option in the top-right hand of the previous message (or start a new thread).
Make sure you have posted your pix on-line to photobucket or some such on-line hosting service.
Click on the image that looks like this 
to open the image dialogue box, which looks like this:
Make sure you paste the entire URL for your hosting service, from the "http" to the "jpg".
Specify width and height if you are posting a high quality picture (600 should be the MAXIMUM width). The height will automatically adjust itself. (This will NOT affect the size of your image on photobucket).
Click OK. You do not have to fill in any of the other info. (FYI -- Alternate text is the mouseover text that appears in certain browsers (and is useful for anyone using screenreaders); border is the image border; HSpace and VSpace are padding around the picture and align is right, left or centre align.)
To add text immediately above an image type in your text, and press "ctrl+enter" for a hard line break (sorry, don't know the Mac equivalent). Then follow the steps above to enter a picture.
One other thing, remember to press enter after every picture so you don't have to scroll right to see all the pictures
Hope this helps everyone post more pix (and more and more and more!)
Joce