There are couple of post install manual configs you need to do in order to get the reporting services Sharepoint service to show up in your sharepoint farm. First of all, you NEED SharePoint 2010 SP1.

  1. In SharePoint PowerShell, as admin:
    • Install the Service > Install-SPRSService
    • Install the Proxy    > Install-SPRSServiceProxy
    • Start the service (You can do this is in CA too)
      • > get-spserviceinstance -all |where {$_.TypeName -like "SQL Server Reporting*"} | Start-SPServiceInstance
  2. Create the Shared Service
    •  Application Management group | Manage Service Applications | New | SQL Server Reporting Services Service Application
    • add your config settings

More details here