How can I reset my main feed?

I changed my main feed to a wrong url that doesn't exist and now my Web PI doesn't start at all.

How can I change the main feed back to default, since it cannot be launched?

Error log looks like this :

DownloadManager Information: 0 : Loading product xml from: http://www.hlicontech.com/zoo/feed DownloadManager Error: 0 : Error downloading product file: 'System.Net.WebException: InternetOpenUrl에서 0x80072EE7이(가) 반환되었습니다. Unknown error 12007.    위치: Microsoft.Web.PlatformInstaller.ManagedWinInet.ThrowGetLastErrorException(String offendingFunction)    위치: Microsoft.Web.PlatformInstaller.ManagedWinInet.OpenUrlAndFollowRedirects(Uri& uri, IntPtr& hInetFile)    위치: Microsoft.Web.PlatformInstaller.ManagedWinInet.DownloadFile(Uri uri, String fileName, String& contentDispositionFileName)   위치: Microsoft.Web.PlatformInstaller.ProductManager.DownloadFile(Uri url, String cacheFileLocation, DateTime productFileLastModified)