You need to satisfy one of the four statements in the prize description, basically proving whether a completely general solution exists in 3-dimensional flat or torus space (4 possibilities). I imagine you are referring to the seven problems, each of them awarded $1M. Actually, the Poincare conjecture (and much more) has been proven by Perelman but to my knowledge he was not awarded the prize, presumably because he did not publish in a peer-reviewed journal, but also possibly because he declined the Fields medal. So my guess is that only $6M remain for you.