First you need a hosting site that will store the pics. you want to post. Photobucket is a good one as you can set up a free account although you're limited in size (number of pics.). I have one and have never hit the limit. The cool thing is you can upload pics. from your computer to your Photobucket account directly from this site. Hit reply and scroll down to "Additional Options" and click on "Display Upload From Photobucket".

You can also use this site as a host and upload pics. (limited in size) in the "Attach Files" box by clicking on "Manage Attachments". These are the pics. that show up in posts that enlarge when you click on them. I'll try to post one of my pics. that will fit; unrelated to your above post. Again, check the file size limit and compare that to the file size of your pics. Pretty slick!
James B.