Login registration page with html in PlayCanvas

I want to create a login and registration page in which a person register first and then goes to the login page if login matches to the registration ,the person enters to the game…
I have studied about changing scenes but implementing them with html css is quite difficult…
Can anybody suggest me if i require to use a database for login registration or is there any other way to do that…

project link

main scene name- environmentarea

sorry here is the project link PlayCanvas 3D HTML5 Game Engine