how to customize hello dolly plugin?

I am trying to play with the Hello Dolly plugin. I want that plugin to work on the front end. Is it possible to bring Hello Dolly to the front end? Or will that affect my existing website?

In your theme, add a custom action in a template where you want to show the output:

do_action( 'show_lyrics' );

This does nothing for itself. Now you can add the function hello_dolly as a callback for that action in your functions.php:

if ( function_exists( 'hello_dolly' ) ) {
    add_action( 'show_lyrics', 'hello_dolly' );
}