Hayley, there were once some instructions on the forum on how to post photos, but I can't see them now. A few days ago, I sent the following to Ryan; it might help you, too.
I use Photobucket. I download the photo I want to post from my own computer into the Photobucket Library. I then open it, and copy it by clicking on the second box that appears on the right, where it says 'Direct'. Then, on the WB Forum, I then go to 'Post a Reply'. There's a little green box just below the word 'Message' (top left). (The 'quick post' box doesn't have this.) I click on that, and a slot appears at the top of the screen: into this I copy the Photobucket reference code. Voilà! The code gets posted into your message, and - once you've submitted it - it turns into a picture!
(I hope that makes sense. If it doesn't, or if you don't use Photobucket, you'll have to consult someone else. I'm a kind of computer Neanderthal!)
'Less is often more!'