Code-Level Tracing in VB.NET

How do I define the Trace Constant for a Web Site in VB.NET to enable trace output? I know where it is for web applications, but I cannot find it for web sites.

From stackoverflow

• Web Site is web application. You can enable it in web.config:

  <system.web>
   <trace enabled="true" pageOutput="true"/>
  </system.web>