ok heres the basics
go to the pic right click Porporties.
Highlight where it says "address URL" right click the highligthed link( http:www.link.com/pic/jpg or somthing along those lines) copy
now come back to the reply to thread/start thread page
click the icon that looks like moutians ( under size)
will show this
right click right after that. then paste then click the "moutains" again too add this too the end
so basicly you have this in your post
{IMG}http:www.link.com/pic.jpg{/IMG}
replaceing { and } with [ and ]