Facing in Android Video searching application

I could not understand the the fifth part of the "Android Full Application Tutorial" series
that where I declare the code in the package of android project, I am new to developing the software and wand to complete code for the part of the series tatorials

 ...
     Intent intent =
      new Intent(MovieSearchAppActivity.this, MoviesListActivity.class);
     intent.putExtra("movies", result);
     startActivity(intent);
     ...
 
     ...
     public class Movie implements Serializable
     ...
     public class Person implements Serializable
     ...
     public class Image implements Serializable
     ...
 
     ...
     <activity android:name=".MoviesListActivity" />
     ...
 

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