Ok adding a picture can be done in 2 ways.
The first method is to use photobucket. ( this is a free image host that stores images for you, for use on forums, auction sites, emails and webpages. )
First upload your image from your computer ( click browse > locate the image on your computer > click open > then click upload. )
once done you will see your image in your account ( see below )
Now right click on the content of the direct link ( highlighted ) and select COPY.
Come back to this forum message reply box ( the one your going to type in )
Type any text you would like before the image.
now click the 7th icon from the left ( has a small tree on it ) See image below.
Now make sure the curser is flashing after the text you typed.
Now right click in the small text box and click paste.
That will add your image code. ( wait a few seconds and your image will load for you to see a preview)
you can now click send
You can also add an image from the web, by right clicking on it and copying the image location link.
You paste that into the box as you would a PB link.