How to display the name of a user after a Welcome message

So I’m trying to get a user’s data dynamically, say user A logs in his name is displayed and if user be is logged in his name is displayed as well on the frontend of their dashboard, and if I want to create a signup and login feature do I need to create the database/table to manage it, I’m new to backendless

This should help:

Thank you sir, I’ll be sure to go through the video