Enclosure link field

Q:What do I type in the link space on the post edit box?
A: Please leave the box blank. This box (for enclosure link) is no longer showing on some post editors.
Here is a link with more info:
http://www.google.com/support/blogger/bin/answer.py?hl=en&answer=42051

source:http://www.google.com/support/forum/p/blogger/thread?tid=2250ae0d6b766248&hl=en