Cant debug with react native debugger

I am starting project as instructed in the readme file (mcnamee/react-native-starter-kit). I integrated my firebase with app when I signup it stucks at spinner... though saves email and password to firebase and it signs in without problem. I want to debug whats going on when I hit the signup button but it doesnt show any action etc nor in the react native debugger app. Why react native debugger cant connect to my app. How can I fix this issue?

The problem was RND was opening in different port. I changed the port from RND menu and it worked like expected.