1. This works best if you open 2 windows: 1 in FSM and 1 in Imageshack, Photobucket, Dropbox, et al. Go to the photo site window and highlight and copy the “Direct Link” address. Go to the FSM widow containing your unfinished post. Go to the menu bar above your post, the icon that looks like a cellphone, the 2nd tier of the message control bar, the ELEVENTH icon  It says ‘Insert Media’… CLICK IT. Paste the Direct Link address into the appropriate space. Then hit insert. 
  2. Wait for the FSM site to show the photo, etc. etc.