As this is a non-standard forum systen, it seems some simple things are not very easy to find.
So here is a guide on how to post photo url's and display them in the post properly.
1. Say you have a direct url to a photo. (from imageshack etc)
2. Click on Extension Components button at top.
3. Select Add Images.
4. Paste in the photo url at top.
5. Then keep clicking on the Get image Size button until the size is auto-detected and filled.
6. Click Insert.
7. Done. =)
This will allow even high resolution photos to display properly in the posts. (Auto-resized to fit)
Then when you click on the photo, an inbuilt viewer will display the photo at its original size.
To see what I mean, just click on a photo in one of my reviews. =)
jayki