Please Help Me How To Replace (Please Login or Signup) Forms With My Registration Page

I want to replace those login text and also want to change forms. I don’t want old way of login style for my website. please tell me i will be appreciated. I’m running a tech website and i’m currently working hard to make it more professional. 

I want to remove/edit/replace this tell me how can i do it. I already edit that file login-signup.php file in your plugin folder but i edit everything didn’t change anything.

which text or code should i remove or replace ?