Rafael, here are your pictures (I presume):
Once your pic are on Ron's site, click on the thumbnail, as this brings in the larger, full size image you downloaded; right click on that image and go to 'Properties', and on that new window, Copy the url (in this case):
http://rongeorge.com/albums/upload/Fokker_Dr1.sized.jpg
Back on FSM Foerum, open up a 'Reply to Topic' window (not the quick reply one), and above the text fields, there are a few icons, including one that represents a picture. Click on it and you'll see this appear in the text field:
[ img][/img]
Note: you will not see a gap between the [ and the first i ; if I add the tag code without inserting that space, it gives this:
Now Paste the url right between the inside brackets of the image tag code: ][
(do not insert any extra spaces or anything else)
Click on preview to check, then post away!