No, Dream Poker doesn't allow US players from most states (but not all). You have to check which exactly are banned, I can't remember right now. About the withrawal... Since you haven't deposited yet, you must have won your money from freerolls. Therefore, you have to play a certain amount of raked hands in order to withdraw. I think it's 25 raked hands, but I am not 100 % sure.