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Lynda, What website are you trying to make the credit card changes on?
Okay,. but the kobo is an E-reader....correct?
do you have a Kobo account?
The Kobo account is where you make the changes to your credit card.........you can access this from ANY device with a web browser.....a computer, a tablet, a smart phone, an e-reader (if equipped)
The ONLY way to make changes to your kobo account, is to FIRST be logged into the account.
Can you login to your Kobo account?
I would like you to look at the image link below, that shows the instructions and how-to for updating your Credit card info on the kobo tablet.
Are you still with me here?