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Open System Preferences
Go to System Preferences and click the Keyboard and Mouse pane.
Select mouse tab]
Select the mouse tab, or trackpad on a laptop.
Make sure the box next to "Zoom using scroll ball while holding," or ''Zoom while holding'' is checked, and Control is selected in the drop-down menu.
Close System Preferences.
Hold down the control key and scroll the mouse wheel up, or drag up on the trackpad with two fingers on a laptop. The screen zooms.
Zoom out by holding down the control key and scrolling the mouse wheel down, or dragging down on the trackpad with two fingers.