This tab allows you to create or modify delegations. In addition to any columns configured to appear, two additional columns are included in the list:
Displays the date the delegation was created.
Indicates whether the delegate has already delegated work items to another user.
You can only add or remove a delegate if you have scope over that user. The minus icon to the left of the User ID will allow you to remove a delegate. If there is no minus icon, you do not have scope over the delegate and cannot remove that user.