Make sure you have at least 15.10 MATIC in your wallet to cover the mint fee and gas.
Select an available Breeder*
Click "BREED NOW"
Accept the MetaMask prompt
Wait for confirmation of your brand new sealed Racer.
Note It can take up to 1 minute for your new Racer to be minted. Once minted it can take up to 2 minutes to show in your kennel. The identity and rarity of your Racer will be hidden until you open the pack which can be done from inside your kennel.
*Available Breeder is any Breeder in your kennel that is opened.