You have received a registration key for the schul.cloud?
This article and the following video will explain how to use this key and a few clicks to create your schul.cloud account.
First, you can decide how you want to use the schul.cloud:
In all the programs mentioned above you will find the link "Register" / "Sign Up" (web client and desktop client Windows and Mac) or the link "Still no account?" On the start screen (directly after opening). (Android app and iOS app) - use this link to create an account with your registration key.
Done - now you can start using the schul.cloud!