How set anonymous authentication in web.config

Dear Expert,
 
I hv a simple web site published on IIS, but I do not hv access IIS to modify the authentication mode. what I think that I can modify the web.config file to allow anonymous access.
Here is my code:
 
<configuration>   <connectionStrings>     <add name="SGRCNRMS" connectionString="Data Source=GDC-SQLT3\SQLT3;User ID=rmsit;Password=Welcome2013;persist security info=False;initial catalog=SGRCNRMS;" providerName="System.Data.SqlClient" />   </connectionStrings>
    <system.web>     <compilation debug="true" targetFramework="4.0" />
    <authentication mode="Windows">       <forms loginUrl="~/Account/Login.aspx" timeout="2880" />     </authentication>
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