What happens next in this paragraph?

How to encrypt a mac hard drive with filevault 2
Click the apple menu in the upper left corner followed by system preferences from the context menu.
Double-click the " security & privacy " icon.
Click the " filevault " tab.
Click the padlock in the bottom left corner of the security & privacy pane and enter your admin password when prompted to continue. Click the " turn on filevault " button.