Change URL

I am trying to start a blog. I used Dream Host to set up a web page at godhealsbrokenhearts.com. When I downloaded wordpress I didn’t really know what I was doing and made the url and site address jks.godhealsbrokenhearts.com. I want to change that on wordpress to the original godhealsbrokenhearts.com but when I go to settings the wordpress address and site address bars are in gray and will not let me type to change the address.