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.