Typically there are two ways to use S4S, programming directly against the S4S libraries or accessing out-0fof-the-box (OOTB) functionality by the user interface.
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This page assists administrators 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.