Forms Authentication: Exclude some specific pages from Authentication using Web.Config in ASP.Net

i have other pages that users must authenticate before having access to those pages, but there is one page i want users to have free access without authentication, can anyone give example?, i tried this below and still didnt work

<location path="post">
    <system.web>
      <authorization>
        <allow users="*"/>
      </authorization>
    </system.web>
  </location>