How do I customize Calendar Template in Project for the web?

Question

I want to create a Calendar Template in Project for the web that reflects Japanese national and special vacations. I referred to the following URL, but cannot figure out the method to create a new one.

https://learn.microsoft.com/en-us/project-for-the-web/create-and-apply-a-work-calendar#create-a-new-work-hours-template-from-the-calendar-templates-page

Is this a problem with my permissions? How should I create it?