EDIT... I started writing this post before Stonk posted his above... his way certainly looks easier!
I'm not an expert on this but....
1. Upload photos onto a site such as Photobucket
2. On the Beoworld thread you want to post a photo on, open a reply window
3.Click on the "insert media" icon next to the smilie face
4 Copy and paste the http code for the pic from the Photobucket site into the "Media URL" box on the Beoworld site.
This is probably a very long-winded way of doing it, but it works for me!
Cheers
Nigel