How do you move up from level 1 to 2?

Sorry if this has been asked before, but could not find it.
Thanks
Do you mean championship level ?
At the end of the season, the 9 first teams of the championship level up.
Thanks for your help. My dad's and mine second day playing. So do you automatically enter a league at the end of each season? Thanks again!
Yes, you are always in a league.
Seasons start the 1st and 15th of every months.