...
Notice that the first operation in the workflow is init, which initializes and establishes the connection to the service (in this example, it contains the authentication information for connecting to Google Spreadsheets). This connection is used by all subsequent operations in the flow unless you specify a different init configuration for a specific operation. To specify an init that has been saved as a local entry, enter its name in the Config Ref property. To create a new init for this operation, click Create New Configuration in the New Config property row, click the browse button that appears, and then enter the initialization parameters.
For more information on using connectors in Developer Studio, see Working with Connectors in the Developer Studio documentation.