Go to Financials.
Choose "Quickbooks Online"
It will redirect to Quickbooks Log-in.
Search "Client" 
Select your "Client" then click "Confirm"
Click "Connect"
Here is the view of imported Financials from QBO to LodgeiT.
Other Helpful Article:
How to Disconnect a Connected Accounting System
QBO Billing: Connecting LodgeiT to QBOA and Billing
Importing Financial Statements from QBO