Welcome to the QuickBooks Community, John. I am thrilled to have you here and appreciate you taking the time to share your concern about accessing account registers in the QuickBooks Online (QBO) mobile app. Let me share the steps so you can manage your accounts.
Follow these steps to proceed:
- Open your QBO app and click the Menu icon.
- Select the All section, and tap the Categories option.
- Select your account to view the register and see your transactions.

To further help you manage your chart of accounts, you can log in to your QBO account via your mobile web browser. Refer to these articles for more details:
Additionally, you'll want to perform the reconciliation process regularly to make sure the balances in your QBO accounts and your actual bank account match.
Please keep me updated if you need further assistance with managing your account registers. Feel free to return to this thread if you have any other QuickBooks-related concerns. I'm just around to provide assistance.