It's good to see you here in the Community, @csuttle-nota-rx-.

I'm here to help connect your American Express Business Checking account in QuickBooks Self-Employed (QBSE).

To ensure you select the correct checking account, you'll want to use the bank's URL when connecting it to QBSE. Here's how:

1. Copy your bank's URL.
2. Sign in to your QBSE account.
3. Click the Gear icon, then select Connect bank.
4. Select Connect another account.
5. Paste the bank's URL, then select the AMEX account.
6. Enter your bank's credentials.
7. Follow the onscreen instruction to connect your checking account.

I'm adding this article for more guidance: Find your bank or credit card account when you connect to online banking.

You might want to learn more about categorizing transactions in QBSE. This will help ensure you put the transactions into the correct account.

Please post a reply below if you need further assistance connecting bank accounts in QBSE. I'll be more than happy to assist you again, @csuttle-nota-rx-.