Good to see you in this thread, @elx.
You, able to connect your bank account is my top priority.
For your visual guidance in connecting your bank account, here's a video that you can check for further details: How to connect your bank account & credit cards.
Once your transactions download, you're now ready to categorise them to organize your income and expenses. For more details, feel free to check out this article: Categorise and match online bank transactions in QuickBooks Online.
Post again here if you have additional concerns about reconnecting your account. I'd be happy to assist you further. Have a great day ahead.
