No option to save a new calendar

I am trying out JEvents calendar for the first time and have just installed the package. I've been through the configuration and, as I want to import events from Google I believe what I need to do is to set up a new calendar and select the 'From URL' option. I did this, adding the URL of the (publicly shared) Google calendar but there's no option - i.e. no button - to save the new calendar.

Am I missing something really obvious (apart from a 'save' button)?

Thanks.

UPDATE:

Yes, I was missing something obvious: the URL I needed to enter was this format https://calendar.google.com/calendar/ical/[email%40address]/public/basic.ics

And now it has worked.