Templates have a default setting that enables automatic naming of a Template.

If you want to rename a Template, click on the A+ icon next to the Template Title box.

A popup will appear that allows you to turn off the Automatic Naming function - click on the toggle so it is no longer Green

Click Save - you can now click inside the Template Title box and change the name of the Template

After the name of the Template has been changed, click on the X in the top right corner to Save the change and close the Template