Using online accounts with icloud

Hi, anyone know how to configure an iCloud calendar in online accounts on Zorin pro 16?

All I could find were these:

Not sure if it is what you need. Don't forget, Apple want you to stay Apple this is not a Zorin issue. For example, when I was at work I installed Zorin 10 on a non-networked notebook and could easily access iPad camera roll to modify videos using WinFF in Zorin - but then Apple changed their security protocols following iOS updates which prevented me from accessing Camera roll on iPads connected to the notebook!