Yes, the QuickBooks Online support team is working. You can contact customer support via chat or phone through the Help menu in your QuickBooks Online account. Furthermore, here's how you can connect your bank account in QuickBooks Online.
Click on the Banking or Transactions tab.
Click on the Connect Account or Link account.
Search the name of your bank, and click on Continue.
Enter your banks log in details.
Select the account you wanted to connect.
Click on Continue and follow the on screen prompts.
Then once done, QuickBooks will automatically download the transactions available from your banks website. If your bank is not yet supported in QuickBooks Online, you can manually import bank transactions using a CSV file upload.
To learn more on how to connect a bank account and categorise your transactions, please check these articles: