@MusicFan0719 Sorry for the trouble you are having redeeming your gift code.
You should be able to redeem your gift code by visiting the Pandora website.
Please note that we require payment information to begin a trial of Pandora Plus, Premium or Premium Family. That's because it helps us to provide a smooth transition for those who enjoy the trial and want to continue the service, but it's also a common practice among many online subscription services.
In the meantime, I have also created a ticket with our support team for you.
They will be contacting you privately via email to help look into this further, so please keep an eye out for their message.
Thanks for your patience!