In the form to post, there is a place at the bottom that reads
"Picture URL"
in that box you put the URL to the image you are wanting to post.
To do so the image must be on a server somewhere so that you have an web adress to point it to.

If you don't have server space, or don't have a space that isn't easily trcked back to you, there are some places that will allow you to host images on their servers to link to, a few are:

http://www.imageshack.us/
http://www.trenzhost.com/
http://www.photobucket.com/


If the image is in an email or on another site you first have to save it to your harddrive (right click > "save image as", and then take note of where you saved it....that will make it easier to find when browsing to upload it    
Upload it to one of the sites listed above, and get the URL for the image.
Then once you have the image's URL just copy it(ctrl+c)and paste it (ctrl+v) into the  "picture URL" box on the post form.

Hope this helps.  

I would like to say thankyou to all of the people who have helped me....

I just want to say thank you for all of your help with the tech stuff.  You all are very kind.  Thank you again.....

MonsterJazz