To access your free spins, you will want to go to the menu and select Rewards > Bonuses > My free spins.

On this page you will be able to see how many free spins you currently have available. When you are ready to play, your spins, select "Spin now".

The Million Dollar Slot will generate for you, and from there you can spin for a chance to win $1,000,000! Your winnings will be instantly credited to your account.