tomcat7 - how to enable tomcat manager for a specific domain

I am trying to configure Tomcat Manager on 2 domains.

I am accessing the Tomcat Host Manager using the IP address of the server.

Now, once I have added the 2 domains via Host Manager, I am trying to access the Tomcat manager app for each domain(so that I can deploy apps to each domain). However I am getting Http 404 error for both domains' manager apps.

Is there something I am missing here? How do I enable Tomcat Manager so that I can access it using the domain names ie http://domain.com:8080/manager/html