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You have two ways to update your password, @charlienash_kr.
You'll have to select Edit sign-in info under the Pencil icon to update the password of your credit card account.
But if clicking the Pencil icon will route you to your Chart of Account info, your credit card account is not connected to the banking feeds.
You'll have to connect and add your credit card account instead, no need to update your password. here's an article for the detailed steps: Connect bank and credit card accounts to QuickBooks Online.
I'm also adding a reference here for more ideas about how you can categorize your online transactions: Match and categorize bank transactions in QuickBooks Online.
Keep me posted in the comments if you need more help. Thanks!