On dMania, 15% of the rewards of every post are distributed among dMania supporters. The Chosen Ones System selects three Chosen Ones from the dMania supporters and assigns them 5% of the rewards when someone creates a post or comment.
To become a Chosen One, all you have to do is to delegate Steem Power to dMania. The more Steem Power you delegate, the higher your chance to become a Chosen One. The dMania bot uses the collected Steem Power to upvote posts on dMania. dMania supporters control the bot upvotes based on the amount of Steem Power they have delegated.