Every Monkey game needs a Main() function. To find it, select the Code tab in the info box. There you find two parent nodes. Try to find Main() in one of them. Found it? Good. Click on it. You will see that the code area changed and the cursor jumped to the top line of the definition of the Main() function:
Navigating through a script is very easy. Search for the item you want to jump to inside the Code tab of the info box and click on it. The content of the code tab always reflects the changes inside the code area!