Swing/AWT/SWT :: Changing Text Of JLabel From Another Class

Create a dnd (dungeons and dragons) character creator and back ground generator, have it display and run on a gui, to start with i decided to creator the gui as i go so i can see the progress, first i tried eclipse and windows builder, well after 1 day of reinstalling windows builder in about 5 different ways from multiple guides and sometimes getting it to partly work ...

After doing some more research I have figured out how to get the main program to display the gui . Heres what i have:

package com.mrgreaper;
import javax.swing.*;
public class MainWindow {
private JPanel mainWindow;
private JLabel playerlbl;
private JLabel playerNamelbl;

[Code] .....

Now this works fine and the gui displays when the program is run but I can't change the text of any of the jlabels or textfield. If I try to do it in the main class i need to change them from private to public static but then in the form builder it says "cannot bind to static field *name of field*" but if i take static off then i cant change its value!

From what i understand this is because the window is an instance, so how to i change the value in that instance? I could put all my code in the one class, the one that creates the gui, but i really want it seperate, i would like the gui to update as the code runs... So how do i do it, how do i change the contents of jlabels on the fly, read the contents of text boxes on the fly etc....

I tried adding a getter setter

public void setCharFirst(JLabel charFirst) {
this.charFirst = charFirst;
}
in the MainWindow.class

Then i tried to set it from my main function

MainWindow.setCharFirst("test");

but it cant access it as my main function is static and it is not now can i make it static...