Routes or Urls in ASP.NET Web Forms

I have an ASP.NET application with WebForms it is hosted as follows: link .

I want when typing in the browser link it goes straight to link .

I know how to do this in ASP.NET MVC through the routes but how can I do it in WebForms?

Another detail is that I use FormsAuthentication and sometimes when I type: link

It forwards to: link

After I log in he redirects to link and page error is not found.