To delete a rate of the rates table of a shipping rate profile:
Click Settings in the Menu bar.
Click Shipping Rates in the Pricing and Ordering section of the side menu. The Shipping Rate Profiles overview page is shown.
Click the name of the profile. The Shipping Rate Profile Properties page is shown. This page shows the properties of the profile and a list of the rates if applicable.
Check the checkboxes in the first column.
Click Delete to remove the rates. A warning dialog is shown before deleting the rate(s).