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After you had installed our Salesforce & QuickBooks package from AppExchange of Salesforce, You need to select DBSync:QuickBooks Integration from the Force.com App Menu which will launch DBSync QuickBooks Integration app. Now, You will need to navigate to Setup tab to setup your Salesforce and QuickBooks connectors that will open connections with the respective applications.

Setup

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As shown in the above image, Navigate through Setup wizard which is self explanatory for an user to finish his connections with Salesforce and QuickBooks Instances. 

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