Update payment method

I am trying to update my AVG VPN account but it says it is not possible to update from my account.  Does anyone know how to update?

Hello Erin,
Thank you for reaching AVG Support Community.
We're glad to point you in the right direction.
Please use the below chat link to contact our AVG Sales team, they will certainly help you to update the payment method.
https://support.avg.com/support_sales_chat
Thank you.