How to edit Global Site Header/Footer

1. On your page editor, click on Global Site Header / Global Site Footer (whichever you wish to edit)

2. From the message prompt, click on Open in global content editor

3. It will redirect you to the Global Content Settings,

Click on Content tab and click on the module you wish to edit

4. From the message prompt, click on Edit global module

5. You can now edit the Footer and Header settings (as shown below)