Config susscess full for newbie

hi all

this is my config suscessfull for all error Installation and Configuration :
-Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.
with
Source Error:
Line 139: </assemblies>
Line 140: </compilation>
Line 141: <authentication mode="Forms"> ***shown in Red

- ....

Config suscess:

  <connectionStrings>
    <add name="NopSqlExpressDB" connectionString="Data Source=SERVER\THANGPH_SERVER;attachdbfilename=|DataDirectory|NopCommerce.mdf;integrated security=SSPI;Persist Security Info=False;" />
    <add name="NopSqlConnection" connectionString="Data Source=SERVER\THANGPH_SERVER;Initial Catalog=nopcommerce;Integrated Security=False;Persist Security Info=False;User ID=sa;Password=123456;Connect Timeout=120" />
  </connectionStrings>

please verify that your website directory is configured as an application root. Many people have uploaded the physical nopCommerce folder to their root directory giving them http://www.yourstore.com/nopcommerceweb/default.aspx.

You need to make sure upload the CONTENTS of the nopcommerceweb directory to your root website e.g. http://www.yourstore.com/default.aspx.

Or, make sure that the nopCommerceWeb directory is configured as an application root.