Only when a question has be answered definitely, i.e. there is a real world event to prove an answer, it can be settled. Until then a question is undecided. Several answers exist with various degrees of likelihood.
How to enter predictions
To enter your prediction, please participate in Prediki's forecast market, where you buy and sell answers with Prediki's free system currency, Credits. If the current market price of an answer is lower than its likelihood (in your opinion), then you should invest your Credits "in favour"; if the likelihood is lower then invest "against" it. After your transaction the market price will change; the larger your investment, the larger the change.
How to win incentives
If you trade in this fashion while a real-money incentive (prize money) is active, you can win a portion of it. The incentive is apportioned to participants pro rata to their trading profits during the incentive period.