I am sorry to hear you are experiencing difficulty finding the View Page template editing options. If you are using the classic library, this help article should help you find the template editing options.
If you are using the beta Library:
Select the folder for which you would like to edit a template from the left side of the page.
Click the Edit tab in the folder view to reveal folder options.
Choose the template you would like to edit from the drop down menu, and click Edit.
The Template Settings editor will open. Make the changes you would like and use the preview to see how they will look. Don't forget to save!
I hope this helps, and please let me know if you have any other questions!