Hi
I've removed Steves link to the instructions because this forum software is more advanced than others!
When you post a reply to a topic there is a button on the bottom of the screen which opens up 'Additional Options'. In the empty boxes which say 'attach' (you can add 2 photos at a time) click on the 'browse' button. You can then navigate your computer to choose which image to upload. Then save. Viola!
You don't have to upload it to another website before you can see it here like you have to elsewhere.
Regards
Mike