Newbie Question with 4 pin button
Internally those little tactile switches look like this:



That means that the two pins on the same long side are connected together.  So you can use, when you hold the switch vertically as in the image on the page you link to the two left-hand pins are linked together, and the two right-hand pins are linked together.

So you can use either both the top pins, both the bottom pins, or the top left and bottom right or the top right and bottom left.

Using either both left hand pins or both right hand pins will be as if you were sat on the button and it was permanently pressed.