http://www.imageshack.us/
Click the Browse button to find the image on your computer that you want to upload.
Click on the UPLOAD NOW Button
When the page changes scroll down to the bottom and highlight the Direct link to image. Right click with the mouse, then click on the popup box copy. Now open notepad on your computer, left click in the white space, then right click in the white space of notepad, then click on paste in the popup box.
When you want to add an image to the forum. copy and paste the image url in the new post or reply. Highlight it then click the img button the url should then be surrounded by the img tags.
Finnish your post as normal.