To access the slot machine left click on it in the friends bar at the bottom of the main screen.
Press the spin button to play. You get 5 free spins every day and you can add more spins by pressing the add spins button.
Adding spins costs cash.
The slot machine has a series of win-lines which become unlocked for every 5 friends you have in your friends bar.
Unlocking more win-lines increases your chances of winning a prize up to a maximum of 5 simultaneous prizes.
You can view the possible combinations by left clicking the �?� button on the slot machine