Advertisements - Can't connect to ads in the new way

Hello, forgive my ignorance, until now I used ADMOB
I understood that you need to switch to GOOGLE Ad Manager
I connected to Kodular premium
I’ve been looking for a few days now for how to connect to advertisements using the new method
Isn’t there an organized guide?
I tried to use this link Monetization - Kodular Docs
do not get along with
Please can anything help??