Once you're in Application, double click on the app that you want to use. In this example, we're opening the Mail app.
Note that the appearance of the Mail app is unique in each computer. The app will now appear on the dock, as shown below.
If you are using a mouse, right click on the mouse and the following dropdown menu will open.
If you are using the computer's built-in trackpad, hold the Control key on the keyboard and tap on the trackpad to open the dropdown menu.
The app will move to the left of the black, vertical line as shown below, and it will stay there permanently.
Created with Tango.us