Hi Arlene, the stars in your club adds when you evolve your club. In order to evolve a club, you need Catalysts. Catalysts are clubs with the same stars. For example, you are evolving your 2-star club. You need 2 clubs with 2 stars as Catalysts to evolve your club. For more information regarding this matter, please follow this link: https://perfectswing.freshdesk.com/en/support/solutions/articles/47001110728-how-do-i-evolve-a-club-
Have a Perfect day!