anyone can do this - it's not a club in that sense - you have to do a power up and take a screenshot of it, which you then publish in an extra post, you then just have to put the TAG #club5050 & #steemexclusive. I'll write a detailed tutorial on how to do this later today.

Here I wrote about it: https://steemit.com/hive-199722/@fun-games/eng-deu-steemit-inc-rewards-a-power-up-with-high-vote-you-don-t-have-to-be-a-member-of-a-community