Delete symbol does not appear in invoice editor

Delete symbol does not appear in invoice editor

I am trying to follow these instructions.

Please follow these steps to delete the discount column in templates:
  1. Click on Settings tab.
  2. Click on Invoice Templates under Invoice Settings.
  3. Click on edit link of the custom template you wish to modify.
  4. Click on 'x' symbol appears above when clicking the discount column in editor.
  5. Now Save the template and assign it to the invoices.
No 'x' symbol appears.  I have tried using both Chrome and Internet Explorer.