Here is the relevant code to your problem (next time you should add relevant code to your post instead of just put a link to some other site):
public class TTTGraphics2P extends JFrame {
...
private DrawCanvas canvas; // Drawing canvas (JPanel) for the game board
private JLabel statusBar; // Status Bar
public TTTGraphics2P() {
...
statusBar = new JLabel(" ");
statusBar.setFont(new Font(Font.DIALOG_INPUT, Font.BOLD, 15));
statusBar.setBorder(BorderFactory.createEmptyBorder(2, 5, 4, 5));
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
cp.add(canvas, BorderLayout.CENTER);
cp.add(statusBar, BorderLayout.PAGE_END); // same as SOUTH
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack(); // pack all the components in this JFrame
setTitle("Tic Tac Toe");
setVisible(true); // show this JFrame
}
...
}
I'm having trouble with adding text relative to the position of other
elements. I have tried creating another container but it's not
working. I would like to place a footer of text either below the
"statusBar" or above it.
Don't know what have you tried but you can follow a Nested Layout approach and wrap two (or many as needed) components into a panel and add this one at content pane's south position. Something like this:
...
statusBar = new JLabel(" ");
JLabel someOtherLabel = new JLabel("Some other label!");
JPanel southPanel = new JPanel(new GridBagLayout());
GridBagConstraints constraints = new GridBagConstraints();
constraints.weightx = 1;
constraints.anchor = GridBagConstraints.WEST;
constraints.fill = GridBagConstraints.HORIZONTAL;
constraints.insets = new Insets(8,8,8,8);
southPanel.add(statusBar, constraints);
constraints.gridy = 1;
southPanel.add(someOtherLabel, constraints);
Container cp = getContentPane();
cp.setLayout(new BorderLayout()); // default layout manager is actually BorderLayout
cp.add(canvas, BorderLayout.CENTER);
cp.add(southPanel, BorderLayout.SOUTH);
...
Note: the example makes use of GridBagLayout but might find a more suitable layout manager based on your needs.
Suggested reading
Take a look to Lesson: Laying Out Components Within a Container