When the Bonus is available for your account, it will be visible in Wallet > Deposit.
The Bonus is activated by default, meaning it will automatically apply to your next qualifying deposit. For new accounts, this means it will apply to your first deposit.
If you wish to save the Bonus for another qualifying deposit within the defined timeframe, you can switch it off using the toggle. When you're ready to use the Bonus, simply switch it back on before making your deposit.