OS X Use a trackpad or mouse
In OS X, you interact with your Mac using gestures that let you switch between apps or pages in a document, navigate your content, and get the most out of your desk space.
Every portable Mac comes with a built-in trackpad, and every iMac comes with an Apple wireless mouse or trackpad. You can use either an Apple wireless mouse or trackpad with every Bluetooth enabled Mac.
Use Trackpad or Mouse preferences to adjust the way your trackpad or mouse points and clicks, scrolls and zooms, and responds to gestures.
Choose Apple menu > System Preferences, then click Trackpad preferences or Mouse preferences.