This is a question for Forum Dad and his Wizard!
However there is an easy way to use the images already uploaded to the coin forum that you can try right now.
Go to the coin forum.
Right click on the image->select copy image address.
Go to your new post in the stamp forum.
Right click->select paste to paste the image address into your post.
You should get a link in your post like this:
http://www.coincommunity.com/forum/...%20green.jpgNow to display the actual image in your post, surround the image address in a pair of image tags [
img] and [
/img] like this:
[
img]http...[/img
]
You will get this:

Use the preview button before you submit your new post to the stamp forum to make sure you have it right.