Two ways. The easiest way is as Unclet said.
The other way is if you have a place online that can be ref'ed from external sites. Then you use the image button you used, and put the url of the image between the ][ . Example replacing [] with () so you can see:
(img)http://urebelscum.speedhost.com/images/49way_blankgrid.gif(/img)
I second what urebel said
You could also post images in this thread
http://forum.arcadecontrols.com/index.php?topic=51525.0instructions are in there somewhere I don't remember what page but basically
post your image in that thread,
Open a 2nd tab in your browser when posting
1st tab is your new post
2nd tab is your images posted in the above mention thread
rt click your image and copy image location
go back to your new post tab and in your post where you want your image click the little picture frame icon, paste the image location in between the brackets. Thats it, now you have images in your post not beneath it.
Clear as mud right?