Related Questions:
Is it possible to edit a template in the document template library?
Answer:
You sure can! You'll first need to copy the template from the Standard Templates. Once you have done this, you will be able to edit like any other Document Template.
Select Settings
Select Templates & Files
Select Event Temple Standard Templates
Hover over the Document Template you want to use and Click the Preview Eye Icon
If you wish to use this Document Template, click the Copy and Use button at the top of the preview
Make the desired changes.
When complete, click Save at the top-right.