The first post in this thread mentioned that "posters" created would have to be hosted elsewhere to post here.
Try saving the photo to your computer and uploading it to photobucket.com (you'll have to create an account if you don't have one).
In Flickr I know you can generate a URL for the photo... Try putting the tags on yourself. Example, [img]<image URL>[/img]
There are instructions here
http://www.lcficmbs.com/ubb/ultimatebb.php?ubb=get_topic;f=11;t=000005