Hit the "Quote" button on this post and you can see what it looks like.
Important things are:
1. begins with "http://"
2. ends with ".jpg", ".gif" or ".png"
3. wrapped with IMG tags in the 
There is a white box on your album that has the whole line tags and all, you can just copy the whole line out of the white box UNDER the picture (clicking once will select the whole string then use copy or cut and paste).