FH5 World Cup?

i know this is a dumb Q, however i cannot figure it out.
which do i need to enter to participate in the World Cup? how exactly does it work?
thank you

by choosing a car for each event enters you into the world cup.

So this week by choosing the Porsche for the trial, you gain ‘points’ for Germany in the world cup.

If you choose the Corvette for the playground games then you are supporting America and gaining points for them.

Hope this helps