On the computer:
Open Dialpad application. In the top left corner of the window click the messages button displayed below.
This screen should display on the app. Enter the name or number of the person you want to message at the top and type your message in the bottom box. To send click the triangle in the bottom right corner.
On the Mobile DialPad App:
Open DialPad app on your phone. In the top right corner of the app click the message icon displayed below.
This should bring you to a screen with the option to type in the name or phone number of the person you wish to message at the top of the application.
Type message into message box and click triangle in bottom right corner as shown below to send.