Whenever I want to post something I bring up the picture on my system, make sure it's smaller than 800x800 and then save it to my desktop so that when I go to upload I can find it quickly.
You have to be in "Go Advanced" and then add the attachment, the little paperclip looking thingy. Click on Browse, find it on your puter and click upload. It'll tell you if it's too big. If it is, make the pic smaller and try again.
Vance, good luck on finding an original. Most are fakes but there are some out there. Make sure it's authenticated.