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Thanks for posting here in the Community. I'd be more than happy to help you link your Amex card to your QB Simple Start account.
There are just a few steps to get this done. Here's how:
1. Click the Banking tab in the left navigation menu.
2. Select the green Add account button in the top right corner.
3. Search for your bank or credit card and choose it from the list.
4. Enter your login credentials and click Continue.
This article provides additional info for connecting credit card accounts to QB, and will walk you through the rest of the steps: https://quickbooks.intuit.com/community/Banking-and-bank-feeds/How-to-add-and-connect-bank-and-credi....
Once your Amex account is linked you'll be able to keep all of your transactions organized in one place. Please let me know if you have any other questions. Take care.