The actual and official site of the American Idol contest is www.americanidol.com, and typing that address into your browser and going there is your first and foremost step in finding out who lost on American Idol tonight.
After you are there the next thing that you want to go ahead and do is mouse over to the right hand side of the screen and then mouse over on the words "show info" and you will see something to click on that says "episode recaps." You want to click on "episode recaps" which will lead you into the next step.
At this point all you have to do is flip through the episode recap pictures and read the captions to find out who lost on American Idol tonight. You also have the option of looking through recap photos and recap video that is listed off to the right.
Sometimes you might get lucky and see that the results of who lost on American Idol tonight are posted right on the main page front and center and you don't even have to navigate to another section. In this instance just follow whatever links are on the main page to find out who lost on American Idol tonight.