Have a look on the Photo thread, it ells you on there how to post piccies, basically you have to put them on a site like photobucket (there are others), then transfer them from photobucket to COL using the copy & paste.
Hope this helps a little
1 hint I found handy was to open two tabs at once, one for COL and 1 for photoediting site, then you won't have to keep closing one to open the other.