We can appreciate that this can be confusing! In this case, after you have made your eligible deposit, you simply need to bet through the bonus bet value as it appears in your My Offers section (via your Profile tab in the top right corner).
As you can see in the 'My Offers🔥' section below, the $100 bonus can be redeemed by placing $100 worth of cash bets while using the Deposit Match token (even though we deposited $200 as per the 50% deposit match).