To connect a Salesforce instance navigate to the admin settings --> Salesforce and add an instance. Select the type of instance(Production/Sandbox) you would like to connect and click on Continue.
After clicking on Continue, you would be redirected to Salesforce where you'll need to login with the appropriate Salesforce account.
Once connected, please log in using Salesforce SSO with your account and your Sellular Salesforce sync should be set up.
Please note that for Salesforce<->Sellular sync to work following conditions must be met: