make a new webpage and save it as calendar.html.

if you are using an online editor, publish will usually save it and have it ready for you.

if you are using an offline editor, upload the html and image files and then it is ready for you.

I'm trying to find this out too for file manager/visual/text editor.

Does not seem to give me the option of making a new page.

I got my existing pages on the site by using website wizard first, but I don't want to go back to that now because I will lose what I have customised.