Oh right, well it is actually easier than it seems.
For example, let's say the URL of your image you wish to show is :
http://www.jewel.ie/jewel1.jpg
In your post
- Click the IMG button
- When promted, paste the URL of the image, in this case, the above.
- then click the IMG button again.
If you don't know how to get the URL of an image, all you have to do is go to the site where the image is.
Right-Click the image
Left-Click on Properties
The URL is the 'address'
Copy that exact link, including the http:// part
Any hassles, let me know