Iberia – reward flight cancellation rules with 3rd airline

[WorldFlyer]

Hi,
Does anyone know the cancellation rules and times for cancelling a reward flight booked on Iberia, but with American Airlines?

Can this be done online, if so, how?

Thank you

[meta]

American Airlines flights booked via Iberia are non-refundable. All partner redemptions except BA are non-refundable.