Hi,
Yes, Tockify is an external calendar service. This WordPress plugin is just an adapter to make it blend seamlessly into WordPress sites.
That means we can’t use your WordPress login to identify you. Instead we have our own account system that identifies people (which we need to do so that you and only you can edit your calendar).
Accounts are free and there’s a free version of the calendar which you can use for as long as you like at no cost – the subscription versions are far more functional/customizable though.
Our support email is [email protected] – you’ll get faster answers there.
I hope that helps.