How do I add a second bank account onto my quickbooks iPhone mobile app?

I'd be glad to help how you can add a second bank account into your QuickBooks iPhone mobile app, @sakuma-ne-gmail-.

When you connect your account, QuickBooks automatically downloads your bank transactions. 

To easily link them, here's what you need to do: 

1. From the main menu, choose Banking.
2. Click+ to add an account.
3. Search for your bank or select from the list of popular banks.
4. Choose your bank from the search results.
5. Log in to your Financial Institution.
6. Follow the steps to add your account.

Take note that when you first connect an account, it can take a few minutes for the downloaded transactions to appear.

Additionally, you may also review this resource to help you review transactions on your iOS after adding the second bank account. For detailed steps, please refer to this article: Categorize bank transactions. 

Stay in touch if you have other questions about connecting bank accounts in QuickBooks mobile app. I'll be happy to help you again. Keep safe and have a good day!