To add the pics in the threads, I use a file sharing site called tinypic.com. I go to that site, and choose a pic to upload, and make sure I use the resize menu to pic the size that's for message boards. Once the picture uploads, it will give you a string of letters and symbols that you can click on to copy. Make sure you copy the one for message boards again. Then you just paste it in the thread. To check if it worked, just preview your message, and see if the string of letters and symbols turned into your pic.
Hopefully I am explaining it well enough. Good luck.