Well, I guess now we've had a few trial runs I think I can put up some photo-posting instructions to anyone who is interested. Didn't want to put them up before until I'd actually worked it out properly!
First thing you need to do is log on. Then go to
http://www.network54.com and click on "my resources". Then create a new realm. You can upload image files to your realm.
Then back on the THF when you write a message there should be a button at the bottom of the text box saying "insert object". If you click on that then you can insert something from your realm. (Not sure that this works on Linux though if that affects anyone??)
Any problems please shout.
Have fun!
Catherine