You can now edit existing templates. From the designer (while logged in as ADMIN):
1) click on GENERAL TEMPLATES BUTTON
2) pick the template category under "Show Saved General Templates in:"
3) from list of templates click on IMPORT for the desired template
4) Make edits
5) click on GENERAL TEMPLATES BUTTON
6) click on SAVE OVER LAST IMPORTED to write o\ver the existing template
Mark :-)