Separating controllers so they can work on their own

Hello all! 

Besides the default controller I made another called Register with a function called pass. I added a button that would link from default controller to Register and it ends up showing a 404 error. I look in the url and this is what shows up:

http://culturedkink.com/index.php/Welcom...ister/pass

I realize no matter how many controllers I create it ends up being connected to the default (Welcome). How do I separate so they can function on their own?

 ,
Mekaboo