Until you have 50 posts, you can't use the attachments tool (although this worked in some categories like plant problems, but not my grow log)

Upload your pictures first to a host on the net (i used photobucket.com) then for each link they will give you a URL. Click on the paperclip with the globe picture on the top of the reply box, and copy that URL in there.

Once you have 50 posts you should be able to use the attachment tool, which is lower on the reply screen, under additional options. hope this helps..