To post a pic, you need to host it online.
Do this by uploading it to a hosting site such as www.photobucket.com
You then get the URL of the pic and paste it in here and put [img] tags either side of it.
The forum then automatically pulls up the pic from whatever URL you provided it and it is posted as a pic.
Click 'quote' on any post which has an image in it to see how it is done.
Smoke me a kipper, I'll be back for breakfast.