ionic 2 login page - nexo login

I’m developing my first Ionic 2 app and its based on the tab starter app. I want to add a Login Screen before the tabs appear and be able to get back to that screen from a button. When the login screen re-appears I obviously don’t want it to be on any navigation stack i.e I want the app to effectively start again (before the tabs are opened). skp kemdikbud go id login