Enable Export Data Feed option SSRS report

Hi All,

         I am working on SSR reports and I required to get the "Export Data Feed"  option in the SSRS which it is not visible.I had added the below tag  in render section closing tag,But I don't find any solution. Can any one help me how can I solvew this

<Extension Name="ATOM" Type="Microsoft.ReportingServices.Rendering.DataRenderer.AtomDataReport,Microsoft.ReportingServices.DataRendering" Visible="True"/>