hey link955,
If the image is located on any website all you have to do is:
1. right click on the image and select properties
2. Copy the URL for the image. This will usually start with HTTP and end in JPG, GIF
3. Type
[ img] in you post where you want the image displayed just make sure there are no spaces when you type it. (I had to use a space or it wouldn't show up in this post)
4. Paste the URL immediately after the
[ img] with no spaces
5. Then type [/img] directly after the URL without spaces.