1. First, click the Apple icon in the upper left corner of the desktop;

2. Then select "System Preferences";

3. Then click "dock" in the system preferences;

4. In the Dock settings, you will see many settings about the Dock desktop, such as size, magnification, position, effect and so on.

5. Find the "location on the screen";

6. Then select the position as left, bottom or right as required.