You can check if you have free bets in your account by clicking on the icon in the upper right corner of the homepage of your DAZN Bet account.
Once there you can see your Cash balance, Bonus balance and your Free bet balance:
When you first sign in, a yellow square flashes "FB" over the avatar image on the upper right-hand of your screen to show if you have a free bet available:
Below are examples of how it looks, both on Mobile devices and PC:
By clicking the avatar, you can see your free bet balance
In this example, the customer has a free bet of £5.00
By clicking the avatar on your mobile device:
You can see all of the balances on your account, including your Cash balance, your Bonus balance, and your Free bet balance: