From the left navigation bar, select
[Menu] → Settings.
On the right, under Tracking, select Unique Domains.
Find the unique domain you want to delete.
Under Actions, select Delete.
Read the warning message, then select I understand, continue.
Progress
From the left navigation bar, select [Menu] → Settings.
On the right, under Tracking, select Unique Domains.
Find the unique domain you want to delete.
Under Actions, select Delete.
Read the warning message, then select I understand, continue.