I hope this is a daft question... but how do you edit a rule/link after you have saved it? We have "lock", "unlock" and "delete" but no "edit".

I intend to use this extension to limit access according to different users, and the list of users for each article is likely to change... I just can't figure out how to amend the properties of a link after it has been saved, I'm hoping I don't have to rebuild the list of users every time I need to change it.