Quick Help

Please I need some help urgently! I am a beginner to all of this but I have knowledge on css, html and javascript. I have connected my app to firebase were I created my database. But I would love some guidance on how to manipulate my login and signup pages to autheticate and store data to that database. The tutorials I have seen use Ionicauth which is not an option for my kind of assignment because I have to share the database with a system already implemented by someone else. Please save a brother here

Use the Ajax APIS of AngularJs. There are lot of tutorial available for this.