If you applied for your card before April 2019, you are already enrolled and no action is required. There is no additional charge for these benefits.
If you applied for your card from April 2019 you were asked to choose whether you wanted the insurance benefits at no additional charge. If you opted out, you can enrol at any time by making a claim with the insurance carrier.
Please visit www.americanexpress.com/uk/insuranceportal for full details of the insurance benefits provided on your card and how to make a claim.