You can obtain credit balance insurance through your credit card issuer when you sign up for a new credit card. You can also ask your credit card issuer to start the insurance coverage on your existing card at any time.
When coverage starts, there is usually a 30-day "risk-free" trial period, during which time you can cancel the policy and obtain a refund of any premiums you have paid. You may cancel your credit balance insurance at any time by contacting your credit card issuer.
Credit balance insurance is optional and is not a condition for obtaining a credit card.