To claim a no deposit casino bonus, first, sign up for an account at the online casino offering the promotion. Ensure you enter any required bonus codes during registration. After your account is verified, the bonus will typically be credited automatically or may require you to opt-in. Check the terms and conditions for wagering requirements and eligible games. Once the bonus is in your account, you can start playing without making a deposit. Remember to use the bonus within the specified time frame to avoid losing it.