In your main xwork.xml, provided berkano-user-mgt-VERSION.jar is in your classpath, you can do something along the lines of:
Note that you could also extend a package from your own application (extends="berkano-profile,myapp-package" for instance) and/or define custom interceptor stacks for each package, etc..
You'll also need a xwork's validation framework setup correctly. As from webwork-2.2, defaults are provided, so you don't need to do anything specific. However, if you use custom validators, you should make sure you the validators used by berkano-user-mgt are available. (check the sources for details, then)