Once you receive a credit to your promotional balance you'll be able to use this when placing a bet. When opening the bet slip if you have sufficient promo balance available you'll see the yellow promo square to the right of the stake box. Clicking on this will pull up a screen which enables you to apply some of your promo balance as a free bet:
After applying this the stake box will turn yellow and show the value of the free bet selected and the bet can then be placed as normal. After placing a free bet using your promo balance these will be marked with the yellow promos icon on both your transaction history and open bets.
Please note that the free bet stake is not returned for winning free bets and you cannot cash out a free bet. For further common questions or queries about free bets and the promo balance please see our FAQ.