I have to leave my computer very very soon, so I'll try to be fast and give you enough to go on.
-Open Run... from the start menu, or hit "Windows Key + R"
-type cmd into the text field
-this opens up the command prompt!
-cd changes your directory. In order to launch the file, you need to be in the directory (folder) where it is located
-typing the name of the program runs it
-putting a /? after the name of a program (example: miner.exe /?) frequently gives you help on what the program can do
-letters after a programs name that end after a - or a / are called switches, and change how a program will run. This is how you can add your username, password, url, etc.
Hope that's enough to get you started! Here's the top site on Google for "cmd help". http://www.computerhope.com/cmd.htm