I thought there was a thread somewhere about how to post pics....
anyway...ill give a 10 cent version =)
basically you first have to find somewhere to "host" the picture for you.
a variety of sites will provide this for you...some at minimal cost...some at no cost
examples are imageshack, photobucket, flickr etc etc.
also aol has their FTP service for free with membership (and membership is free also)...but the interface there is clunky and such.
anyway...once you find a host to upload your picture to...you simply use the little square yellow icon at the top of the post box to paste the address into.
for example if you look at tugs homepage
http://www.tug2.net
the TUG logo in the top left hand corner is merely a single image.
that image address is
http://tug2.net/images/tuglogo3.gif
(this will show up as a link above...as I have not chosen to click the yellow box to indicate its a picture)
now with using the same link and putting the proper image tags around it...it will show as a picture. these tags are [img.]http://tug2.net/images/tuglogo3.gif[/img.]
i have added periods so the code shows up....if the periods were missing obviously it would not be displayed that way
so when I remove the periods...it looks like this
clicking the yellow box brings up a new window in which you can type in the address and it will put the IMG tags around it for you...or you can simply just type them in yourself.