After you click on "Post Reply" - scroll down the reply page until you see the "button" for "Manage Attachments".
Click on that and a pop up window will provide you with the ability to browse your computer and upload up to three attachments in various supported file types.
Note that the file size limitations are fairly "severe" so if you are using PS etc. you will need to resize down JPEGs to about 700 on the long side and probably only save in high res (not extra high or finest).
Thanks George
I will try to post over the next week my Famous Swan photograph, I will show the tame images rather than the more explicit.*see my first post*