How do I use panels from other classes in the cardlayout code

See more:

Java

Swing

Eclipse

I am making a game using java. At the beginning of my game there is a panel with a welcome message and then by pressing start you can go to the first level in the game. My question is how to switch panels(to go from the welcome message to level 1). I have found that I can use card layout for that, but I tried with cardlayout, but I have a problem how can I use panels in my cardlayout code from other classes.
Can someone help me with that?

Thank you

What I have tried:

package ColourGame;
 
import java.awt.CardLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
 
public class CardLayOut extends JFrame implements ActionListener{
    CardLayOut card;
    Container c;

    CardLayOut(){
        c=getContentPane();
        c.add(button);    
        c.add(MyPanel);
        c.add(MySecondPanel);
    }
 
    public void actionPerformed(ActionEvent e) {
        card.next(c);
    }

    public static void main(String[] args) {
        CardLayout cl=new CardLayout();  
        cl.setSize(400,400);  
        cl.setVisible(true);  
        cl.setDefaultCloseOperation(EXIT_ON_CLOSE); 
    }
}