Enable 2-finger clicking.
Press the Control key. Press and hold the Control (Ctrl) key while you click the mouse button.
Open your Trackpad preferences as described above. Under the Apple menu, click System Preferences, then click Trackpad.
Get a Mighty Mouse. Understand that any two button mouse can be programmed to work with a right click. Similarly, some seemingly one button mice manufactured by Apple such as the Mighty Mouse or the Wireless Mighty Mouse can be programmed respond to a click on the right side.
Open your Trackpad preferences as described above. Under the Apple menu, click System Preferences, Services then click Services Preferences.
Click on the Point & Click tab. In that window, enable the Secondary click checkbox, and from the menu, select Click in bottom right corner. (Note: you may alternately choose the bottom left corner if you prefer). You will see a short video example of the proper way to click.