To use your free bet bonus, all you have to do is place a bet. On the betting slip, you will see a section which says 'Select your freebet'.
Once you click this, you can select a free bet from the drop-down and it will then be applied to your bet you are trying to place.
If your bet is over the amount of your free bet, the remainder of your bet will be covered with cash funds. If your bet is under the amount of your free bet, the remainder of the free bet will be voided.
Please note, your £10 free-bet will be credited to your account within 24 hours of your bet being settled.