It's easy... you only need the exact link to the pic you want to post. Pay attention: the link must be a link to the pic and not the link to the web page where's the pic posted...
http://www.pbase.com/rends/image/37897371 This is the link to the web page...
http://mishilo.image.pbase.com/u10/r...oKothepark.jpgThis is the link to the pic. You must use this one.
In order to post the pic you can include che link into the tags [IMG]...link...[/IMG]
or you can use the aided procedure with the "post image" icon pasting the link to the image inside there.
The result will be this one:
Hope to have helped you, buddy!