Not sure if someone replied you yet...but here is what I just did. (I didn't know how to do it and read up on how..it was fairly easy believe it or not)
You have to open another window and go here
http://www.imageshack.us/
(there are other sites but this is the one I used)
Once there...click browse and it will take you to your folders...find your image then click host
Then a page will come up with lots of codes and the pic in the far left corner.
Go all the way to the bottom of the page and copy the
direct link code
Come back here to your message you are going post, and at the top where the settings are there is a small yellow box with a mountain...click it..
A box will appear on the page..
ERASE what is there (http)
and paste your code in that space...then click ok.
Thats it! Its not that hard once you get it the first time.
Let me know if you need more help and I'll try to help you.
Hope this helps.
P.S. The site is working really slow right now. Patience!