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You can also search for a URN by using only the Resource Name without the Naming Authority. For instance, If you were looking for a HUL.ERESOURCE:TEST_THIS, where 'TEST_THIS' is the Resource Name, you could enterTEST into the Resource Name field to find it. Asterisks work for wildcard searches in both the beginning and end of a Resource Name.
From the Search Results, click on the Full URN text for the URN you want to edit. If the URN is just text without a link, then your permissions are not set to edit URNs in that Naming Authority. Contact your local NRS liaison to request the necessary permissions.