Hey there! @painter3,
“Your Instant Ink account page has data on past deliveries and estimated shipments. It also helps you understand what state your cartridges are in based on HP’s data. Any issues will be shown with steps to fix. Please check your account page to see the latest cartridge information by signing into your account at “instantink.com”.
Please try the steps recommended below to update the billing details.
Sign in to your HP Instant Ink account to update the credit or debit card information billed by HP Instant Ink. If you received a message that there is a payment problem or your account needs attention, confirm your credit or debit card information.
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Go to hpinstantink.com/signin (the HP Connected website) to sign in to your HP Instant Ink account, if you are not signed in already.
Your HP Instant Ink account page opens.
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In the My Account section, click Change Billing Information, then Edit Payment Information. Make sure postal codes are in the correct format.
Figure : Clicking Change Billing Information

Refer this article to know more information about changing shipping or billing address. Click Here
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A4Apollo
I am an HP Employee