There are two ways to uninstall a game from Steam. You can do it through "Add or Remove Programs" or through Steam. I recommend the latter because if you uninstall through "Add or Remove" programs, it'll open Steam anyway.

To get started, open Steam and login:

1. Click the "Library" tab at the top of the screen.
   
2. On the left hand side of the screen there will be a listing of all the games tied to your Steam account. Select the game you would like to uninstall.
   
3. Right click the game and select "Delete Local Content..."
   
4. A confirmation box will pop up. Click the "Delete" button.

Voilà! The game youre really bad at will start uninstalling (it might take a bit for it to be completely removed.)

You might notice that after you uninstall a game that it's not removed from the list in the left pane. Don't worry, it has been removed.

ːsteamsaltyː