I'm currently facing an issue with my website's forum, which is integrated with Firebase for storing forum posts and user login information. The challenge I'm encountering involves retrieving data from the logged-in user's child in order to display their username on the forum posts. Users create a username during account creation, along with their email and password. My goal is to have this username displayed in the forum whenever they make a post, but all my attempts to fetch the username from Firebase have been unsuccessful. I am looking to streamline this process by sending user data from my login controller to a service.js file, allowing different controllers and html pages to access and utilize the username data as needed.