To Connect QuickBooks:
1. Go to My -> Settings;
2. Click Connect and login to your Quickbooks account
3. Open the new tab in your settings > QB Accounts
4. Select from what date data should be synced to QuickBooks and what Load status will trigger the sync: Delivered, Invoiced, Paid
5. Open Expenses, Accounts, and Drivers and link it to the right Quickbooks account
6. Make sure you select highlighted options