Select required mailbox:
From this drop down box select the mailbox required. The default for this list is your extension. You can select other mailboxes. However, you will only be able to view the Public Lists from other mailboxes, Private lists are protected.
Edit:
Click this button to edit the selected list.
Delete:
Click this button to delete the selected list, you can only delete your own lists. This does NOT delete individual users in a list.