You will find the testresults.war file in the installation directory, in the folder dashboard/webapp.
This file is for deployment into a web server. If you want to deploy the testresults.war into a tomcat server simply copy the file into the webapps directory of the installed tomcat. Please read the instructions of your web server on how to properly install a web application. Once you have done this, you must wait for the folder dashboard to be generated by tomcat.
Configuring the dashboard as a web application is different from the standalone version. You must place the dashboardserver.properties file into the .jubula/ folder in the home directory of the user who is running the server. The dashboardserver.properties is almost the same as in the standalone dashboard, the only change is that the port is ignored. Once these steps have been followed, you can open the dashboard using the following URL:
http://HOSTNAME:SERVERPORT/testresults/dashboard
The server should be started with at least 1GB of RAM.