After you type your post, scroll down to "manage attachments", click on it. new window will poop up. Than chose to browse your computer, it will take you to your computer to find your pic, double click on the picture you want. That will take you back to your "post" window. Than click on upload. It will upload to your post "window" than scroll down to close window and it will close. Now you are back to your original posting and just hit submit new thread. Hope this helps.
Forgot to add this is my windows 7 that i'm using.