Right now, you're unable to use reports on the QuickBooks Online application.
You'll want to log in to your account using a web browser and access reports from there. I'm glad to walk you through the steps on how to accomplish this:
Log in to your account.
Select Reports from the left navigation menu.
In the Find report by name search bar, enter the report name to quickly locate the report you need or browse the categories listed.
Choose the report you want to open.
Check out the Run reports article for more details about pulling up your financial statements. It includes steps on how to set up general report preferences, customise, print, and export steps.