The nice thing is that once it is uploaded using File Manager you can right click on the image, click on "View image" in the pop up menu then copy the url to use in another post.
Here it is with curly brackets:
{img}http://www.talkmorgan.com/ubbthreads.php/ubb/download/Number/28273/filename/IMG_2185.jpg{/img}
And here it is if the correct square brackets are used by the "Enter an image" button when you are making a post: