There are 2 ways to join, first one is to have a 0.01$ upvote. This requirement is the most time saving way to avoid the contest being scammed like it did in the past while at the same time it maximises rewards the the ones who are much more likely to have a longer term mindset on this platform.

2nd way to joing is to be part of the Steemit Betting Community. People who mainly bring Sports Betting related content can become part of our community.

The requirements are always listed in the contest posts themselves.

Good Luck