From the left-hand pane, expand 
Computers and choose All Computers.
From the right-hand pane, right-click the computer and from the menu, choose Tasks, Display Message.
Type a message title.
Type the text of the message that will be displayed at the computer.
Select a message type from the drop-down list.
To give the user a button to close the message window, ensure the box is ticked.
To close the message window after a specifed time, tick the box and set a time limit for the message.
To ensure the message stays on top of all other windows, tick the box.
Click the Options button.
If you wish to display the message if a user is logged on, ensure the box is ticked.
If you wish to display the message if the computer is locked, ensure the box is ticked.
Under Disconnected Computers, define what you want to do if the target computer is disconnected from the network.
Click OK to close the Task Options window.
If you wish to display the message at a later date, tick the 'Schedule this task' box and then click the Edit Schedule button. You are presented with a Schedule Task window where you can specify when the task will occur, whether it will recur, and when it will expire.
Click OK.
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