The Dock contains icons for common programs you’re most likely to use, such as Safari and iTunes. However, there’s a good chance that the Dock currently contains icons that you’ll rarely use, while it does not contain icons of programs that you do use often.
To fix this problem, you can add new program icons to the Dock and remove icons of programs that you don’t need. There are two ways to add a program icon to the Dock:
Drag a program icon from the Finder window to the Dock.
Open a program, right-click its icon, and then choose Options ▸ Keep in Dock.
The most straightforward way to place a new icon on the Dock is to drag it from the Finder window to the Dock by doing this:
Click the ...