for already uploaded images, just get the url and put
[ img] before it and [ /img] after it (without the space after the
"[")
i use (for my own images)
http://www.imageshack.us/
then u just take the direct URL of the hosted image (don't worry
about what the website says about pasting that into forums, just
take the direct link (The selection that says "Direct link to
image" next to it)
and then put [ img] before it and [ /img] after it (without the
space after the "[" )
lol theres probably an easier way to do it but i'm content with
that