.war and .xml file

Dear sir,
I have two files myapp.war and myapp.xml
myapp.war is the application files and myapp.xml is the data source configuration XML file.
I am able to deploy the myapp.war file from the Tomcat Manager and is a accessed from http://localhost:8080/myapp but the can't login the application as i guess i am not able to configure the myapp.xml file and don't know where to configure this file..
Please Genuine People help me to solve my worry..
Thank you.. Kind regards..