I tried another browser. The same issue.
To clarify the issue more:
when I purchased the plan for the first two months, I entered a credit card issued from India. Now I want to change it to UAE. But it is clearly mentioned that I have to contact the support to change it.
Also I don't know how to add a new payment method.
If your account is currently set to renew automatically, and is not in a grace period due to insufficient funds, I would suggest calling Customer Support. If this is not a possibility from your location then you can disable the auto-renew online and repurchase from scratch as soon as the current plan expires.