I'm glad to welcome you on being part of the growing QuickBooks Online family, @Gabriel1958.
While you're waiting for your bank to be approved, you can use our test account. Using this sample drive, you can explore and experiment with the features and options that you might not feel comfortable trying in your own QuickBooks Online account. Please take note that the app will not save the changes you make.
See this link for the UK test drive: https://qbo.intuit.com/redir/testdrive_uk/.
I've also added these resources to help you navigate with QuickBooks Online:
Let me know if you have further questions with QuickBooks. I'm always here to answer them for you. Take care and have a great rest of the day!