I want Configuring claims and forms based authentication for use with an LDAP provider in SharePoint 2010.

I change webcomfig file of :

1.Adjust the web.config of the Central Administration site 

\Inetpub\wwwroot\wss\VirtualDirectories\ Port\_Number\_of\_Central\_Administration — The web.config file that defines configuration settings for the SharePoint Central Administration application.

2.Adjust the web.config of the Security Token Service (STS) virtual directory

C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\WebServices\SecurityToken

3.Adjust the web.config of the claims based web application

**How do find web config file of Claims Based authentication ?**