Put your pics in a folder on your hard drive. Click reply to the post. At the bottom you'll see a browse button. Click it and find the folder that contains your pictures. Pick your photo, then click on open. Next you will click upload and voila! Your pictures should appear.
Hope this helps. BTW....my mutt used to have an underwear fetish to. Cured him of that when I showed him my 300 pound spandex wearing coonskinning neighbor ladies panties hanging on the clothesline. He ain't been right since. :-x :-x