In the Setup > All Contacts, or Setup > Clients screen, click the Edit button for a selected contact or client.
Click the Integration tab.
Click the Connect to QuickBooks button.
The first time you choose this command, the application displays the QuickBooks Online Integration license agreement. You must read the license agreement, mark the agreement checkbox, and then click Save before you can continue. Once you accept the terms, the application will not display the license agreement again.
Click Save to open the QuickBooks Online Sign-in screen.
Enter your user ID and password, and then click the Sign In button to open Intuit's QuickBooks Online application.
If you log into QuickBooks Online as the client's accountant, select the appropriate company from which to import account data. If you logged in as the client, this option does not apply.
Click Next to establish a connection with QuickBooks Online.
When a successful connection is established, close the separate browser window.
After closing the separate browser window, refresh the Integration screen to see the correct connected state.