editing teams for world cup 2022 + number of teams of EURO + AFCON

Hello,

I would like to edit the teams who will participate on the world cup 2022 in FM 2023 (example : replace Serbia by Italy, Costa Rica by Jamaica) but i dont know how i can do it. I trying to do it in the editor > competitions > World Cup > Registered Teams, but when i begin a new game, the changes are not taken into account. 

Someone can explain me how i can do it ?

Also, i would like to change the numbers of team who participate to the EURO nations cup and Africa Cup of Nations (16 teams instead of 24). Someone know how can i do it ? 

Thanks