Save the pic to your "my pictures" file. Use the paperclip icon on the toolbar for your post. It will have you bowse, attach, close. Note that there is a limit on file size. GIF tend to be WAY too large, srick w JPG. Then go back to the paperclip icon, click on the arrow on right edge, the name of the file ou just downloaded will be there, click it, and you should be done.
What we have here is... failure- to communicate.