If you are very new to Struts, it may be easier to take a step back and run through a tutorial so you understand what Struts is and how to use it.
Struts is an implementation of the Front Controller Design Pattern. The Controller fits into another pattern called Model-View-Controller. What you shared with us is part of the "View", that is, the display portion of the application. To actually do something, you need to configure Struts to delegate a request to an Action, which would perform some work, and a Model, which would be the data set that would be acted upon.