When you say game club member do you mean the shop called game?
Or do you mean joining a guild or clan?
Iv never noticed the shop having a club of any sort.
But if you are looking to join a guild or clan in an online game then that's pretty straight forward.
First pick a game that you enjoy playing online,
Then once online in the game chat to fellow players,
Most will be happy to take you on as a guild or clan member,
Most guilds or clans have rules that you will need to follow like no smack talking to other players in game and so on.
But i think im getting slightly ahead of myself here,
Please could you be more specific when you say game club member, provide a link to the website if there is one or any other details as to which club specificly you mean.