PokerTracker

I just purchased PT4 for my MacBook Air after using the trial for a month. When playing on Pokerstars the default HUD is working. However, I cannot find and functions to edit anything. What am I missing?

Are you referring to the menu options in PokerTracker 4? If so move your mouse to the top of the screen then the menu bar should appear temporarily. Next look at the top right of the menu bar and there should be a pair of diagonal arrows that are highlighted, usually in blue. If you click those arrows that should display the menu permanently when PokerTracker 4 is in focus.