To get the "R100 Risk Free" Bonus you need to follow these steps from User Menu: "My Bonuses" --> "Bonus Offers" --> "R100 Risk Free 1st Bet" --> read carefully and "Accept" to activate the offer. You can proceed and place your Risk Free Bet.
YesPlay will credit your player's account up to R100 with free betting money, as stated in the "T's & C's" of the bonus offer.
You need to wager this Bonus money at least once. For example: R100 was received as a Bonus, you have wagered R100 and you have won. Now you can withdraw the full amount, i.e. your Bonus money and your Winnings.