This function is found under Settings> Manage Labels.
Delete a Label
You can also Delete a label. If there are older orders that display the deleted label, they will continue to display the deleted label.
Follow these steps to delete a label.
Step 1 — In the main menu, navigate to Settings > Manage Labels.
Step 2 — In the label list, click the Edit button for the label you need to change.
Step 3 — Click the Delete button.