If you're using Windows, you'll type in those commands in a command prompt window. If you don't know what a command prompt window is and how to use it, then you can find
tutorials for it on the web.
Note: The "%" in those commands should not be typed in, that's not part of the commands.
On Mac OS X or Linux, you'd use a terminal window for the same commands. Some commands might have slightly different syntax on Mac OS X or Linux compared to Windows.