As far as I know, you can't include a pic in a personal message. You would have to use eMail for that. As for posting a pic that resides on your hard drive (aka My Pictures) when the reply box is open, look at the lower-left of the text box. You will see + Attachments and other Options. Click on that and it expands showing a box labeled Attach: (see attached pic for what it will look like when expanded). Click on "browse" to the right of the attach box and you can start browsing to the picture as it is stored on your computer. When you find it, double click on the picture file and it will populate the attach field with that file name. Then just click on "post" at the bottom of the screen and your reply, along with the picture you selected will be posted. Note the allowed file types listed at the bottom.
