Snooker Stars (pool membership)

What’s pool membership and the way do I accumulate stars in pool membership?

So I've maxed all my potential trophies in snooker membership and to progress to larger ranges, it's telling me to earn 5 extra star's in pool membership and for the lifetime of me I do not know what pool membership is? I imply, is pool membership like struggle membership the place no person is allowed to speak about it cos I've requested 1,000,000 occasions and no person is aware of so please assist me 🙏