Typically there are two ways to use S4S, programming directly against the S4S libraries or accessing out-0f-the-box (OOTB) functionality by the user interface.
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Because there are so many permutations and possibilities on how S4S is used, there will almost always be some level of development ways to use S4S, it is likely some development will be required when implementing the connector.
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This page assists administrators to view in viewing the status of S4S and any associated Sitecore modules. After installing S4S navigate to http://yourwebsite.com/sitecore/admin/S4SStatus.aspx where yourwebsite.com is the name of your domain.
S4S List Builder
S4SLB is a Sitecore Desktop Application that pulls lists of contacts and leads (within campaigns and reports) from Salesforce into Sitecore for used with Sitecore EXM.