To type in an image address, it must be an internet address. Use an image hosting site such as Tinypic, Photobucket, or Flickr, to have it permanently stored. After that, whenever you want to use the image, right click on it, select "copy image address," and then paste it in. After that, though, you still have to add the image tags for it to work on these forums. Type [ img ] and [ /img ] without the spaces before and after your image location. This should make the image appear. If this doesn't work, tell me.