Good day, laurenllc2019.
You can follow these steps on how you can add the second account:
- Go to Accounting > Chart of Accounts.
- Click the New button.
- In the Account window, select Bank from the Account Type and choose Checking from the Detail Type.
- Enter the Name, Description, and Balance.
- Hit the Save and Close button.
For reference, here's an article: Add an account to your chart of accounts in QuickBooks Online.
If you want to connect this account for online banking, then you can open this article for the instructions: Connect bank and credit card accounts to QuickBooks Online.
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I'm also adding these articles if you are adding the account as sub-account:
I'm just a post away if you need anything else. Take care!