How To Shutdown PC Remotely

How can I shut down the remote computer after the Remote Desktop connection was made? "On the computer from which you want to shut down the remote computer, open a command window ("cmd.exe" in the Search box). At the command prompt, type "shutdown /i"to display the Remote Shutdown dialog box. Where it says, "What do you want these computers to do?" select Shut down (or you can select Restart if you want it to restart). Type at least one character in the text box for a comment/reason. Click OK." When I tried the above, the "OK" in the dialogue was greyed.