Howto change Keyboard language setting?

The keyboard that I got with my iMac is Dutch and so the [.]dot and the [,]comma are changed on the right side of the keyboard(where all the numbers are, below the volume and eject buttons.

So basically what I mean is that when I press the [.] button it gives me a [,] and I don't want that ...example: $25.95 is changed to $25,95

How can change it to it's original function without changing all the other buttons??

 

I found it!!!

I had to change it in System Preferences->international->input menu