A free play bonus is a bonus that has been designed in order to get players familiar with how the game works before they begin to play with real money. In addition to this, if a player is lucky enough to win an amount higher than the initial free play bonus, he can get a cash bonus as much as $300 for free. This is achieved by depositing the minimum amount in the casino.

Of Course! Free spins sessions may result in real money winnings, which you can then withdraw at the cashier after all the requirements attributed to the offer have been honored. 

In general, wagering requirements are the total amount of bets needed in order to withdraw the bonus money, but in free spins, it's a bit more tricky because you don't actually get money as a bonus, you get spins. So the wagering requirements in free spins are applied to the free spins wins, at the end of the free spins round. Example: you get 10 free spins and the wagering requirements are x10.  You must first play through all the free spins and at the end, you'd win some amount, say $12.  These $12 are not cash - these are the free spins wins, and this is where the wagering requirements are applied - In order for the free spins wins ($12) to become available for withdrawal, you must place total bets to the sum of $12x10 = $120. 

No, players cannot change any of the eligible games that are listed by the casino operator. Any attempt to do it will result in a cancellation of the remaining free spins and any winnings tied to the bonus.