Hi there,
The book explains you how to create the database from scratch, and then create your own accounts. So, you probably don't need the accounts from the downloadable source.
If you still want to log in with the available accounts, check out the Try It Out exercise on page 544, step 7. The whole TIO starts on page 542 and guides you through the process of creating your own account.
Cheers,
Imar
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