The card says:"You can place any knowledge token on any level of the tree."
I'm not sure what would be the use/benefit of that.
What can be done with this knowledge token?
ANSWER: It is the easiest to explain using the example:
The player whose action token is placed by the „Order of the edge of the world” has 5 knowledge tokens. He may exchange one of them into a victory point on any branch of the tree (this is how one may gain a tree marker from the branch below), and the remaining four on the actual branch.