You need to create a room and then invite your friends to the game any way you like. Your friends get the invitation with the number of the room. They should enter this number in the game and you are ready to start playing.
This is a free game, and you are playing against a computer opponent the AI opponent is skilled so you must be on you're a game! You can choose from several different background colors while playing to make the game more interesting. Play your pieces carefully and don't forget to make the best use of the blank tiles!