LINKEDin Authentication Assistance PLEASE

I want to use LINKEDin ID authentication. I watched a tutorial. There is an existing box: SIGN UP. After adding API LINKEDin ID there is another box: SIGN UP WITH LINKED. Now I have 2 sign up boxes. How do I delete the original SIGN UP box? If user doesn’t want to sign in with LINKEDin I am fine with that.