1. Go to Tools > Administration > Settings - Control Panel
  2. Select Custom Fields.
  3. Find the Custom Field to remove, and click Delete.
  4. Confirm that you want to delete the field and any data associated with the field.

Note: Use caution when deleting a field, as this will also remove any previous data. If you want to preserve the data that was previously captured for this field, modify the custom field and uncheck the Enabled box.