Get your mouse to right click on a Macbook Pro Setting up your mouse: First go to system preferences click on Keyboard and Mouse Option Then go to Mouse Option You have four buttons on your mouse. They are 1.Left button 2.Right button 3.Middle button and 4.Squeeze buttons: You can assign different tasks to your mouse buttons: First if you want to use your left button as primary button, you have to select primary button option. Secondly if you want to make your right button as secondary, you can do so by selecting secondary button. Thirdly if you want to make your middle button to select spaces, you can assign that button with option as spaces. For squeeze button, you have many options,but one of them is expanding all windows.you can assign this to squeeze button. Few more options are there like scrolling, scrolling speed etc. You can change them as per your requirements.