Place the mouse-pointer onto the image you wish to add/paste. Right click and select copy image location option.
(http://i51.tinypic.com/vhukpe.jpg)
Paste the link by clicking paste where you wish to add the image.
(http://i55.tinypic.com/2n0r0b4.jpg)
Select the link (that you just pasted) in the Forum. Click on Insert Image option on forum tool bar.
(http://i52.tinypic.com/5nufps.jpg)
To make your image centered, click on centered option.
(http://i54.tinypic.com/2j4ccb5.jpg)
Post your posting from the box underneath.
(http://i54.tinypic.com/2q2gw78.jpg)