The QuickBooks Self-Employed (QBSE) mobile app is no longer available to download from the Apple  Store as of March 24, 2024 for new customers, Jonalee00. 

As for the QuickBooks Solopreneur, we need to download QuickBooks Accounting app because this platform belongs to the QuickBooks Online (QBO) ecosystem. Once done, we can sign up for it so that an account will be created for us to track our mileage. Please note that signing up for this platform (QuickBooks Solopreneur), means that, we will be creating a brand new account.

However, if we want to access the same account that we have (QBSE), we may access it by checking our recent installations in your iPhone history:

1. Swipe up from the bottom edge, or press the Home button, to view the Home Screen.
2. Continue swiping left until you reach the App Library.
3. Look for the QBSE mobile app within the Recently Added folder, which is usually located near the top-right corner. For more information, check the detailed steps here.
4. Tap on the QBSE app to reinstall it. If you don't see the app, I recommend contacting Apple Support for further assistance.

Alternatively, you can log in using the web browser on your iPhone or computer:

1. Launch the web browser on your iPhone or computer and go to qbo.intuit.com.
2. Click on Sign In and from the dropdown arrow, select QuickBooks Self-Employed.
3. Input your login details, which are the same ones used in your mobile app.

I've added a screenshot for your visual reference:

We can also  track our mileage manually via the web browser: Manually track mileage in QuickBooks Self-Employed.

In QBSE, we can also connect our bank. Check this link for your reference: Connect bank and credit card accounts to QuickBooks Self-Employed.

Click the Reply button if you need further assistance in tracking your mileage. We are available 24/7. Have a good day.