To activate KJOS, you don't need to do anything if you already have a Windows 11 Pro key, just look in:
Settings -> System -> Activation
Here, we can see that our system is not activated.
📌 If you have installed KJOS (not the KJOS-Lite version) and already own a Windows 11 Pro key, simply log in to your Microsoft account where you purchased your license.
📌 If you don't have a key, or if you've installed KJOS-Lite, you'll need to get a key from online stores, for example.
📌 KJOS-Lite is based on Windows 11 IoT LTSC, to activate it, you need a Windows 11 IoT LTSC key, not a Windows 11 Pro key, which won't work.
📌 There are other ways of activating Windows, such as using Microsoft Activation Scripts, but these methods can be more or less legal, so use them at your own risk! I won't be held responsible for your actions - they're your actions, not mine!
Once Windows has been activated, you can move on and finish.