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There are several ways to link a Firebase database with a front-end application depending on the programming language being used. Here is a general guide:

1. Initialize Firebase SDK: First, initialize the Firebase SDK by adding the Firebase configuration details to your application. This will allow your application to connect to the Firebase database.

2. Add Realtime Database Rules: Make sure to set up Realtime Database rules to control who can access or modify data in the database.

3. Connect to Realtime Database: To connect to the Realtime Database, you can use Firebase Realtime Database SDKs which are available for several programming languages such as JavaScript, Java, Swift, and React Native.

4. Writing code to retrieve data: To retrieve data from the Realtime Database, you can use JavaScript methods such as .on, .once, .update, .set and .remove.

5. Writing code to save data: To save data to the Realtime Database, you can use the .push method which adds a new child node or the .update method which updates the existing values.

6. Writing code to delete data: To delete data from the Realtime Database, use the .remove method.

Here is an example code showing how to connect to Firebase database using Javascript SDK:

// Initialize Firebase SDK
var firebaseConfig = { 
  apiKey: "API_KEY",
  authDomain: "PROJECT_ID.firebaseapp.com",
  databaseURL: "https://PROJECT_ID.firebaseio.com/",
  storageBucket: "PROJECT_ID.appspot.com",
  messagingSenderId: "SENDER_ID",
};
firebase.initializeApp(firebaseConfig);

// Connect to Realtime Database
var database = firebase.database();

// Writing code to retrieve data
var ref = database.ref("users");
ref.on("value", function(snapshot) {
  console.log(snapshot.val());
});

//Writing code to save data
var usersRef = database.ref("users");
usersRef.push({
  name: "John",
  age: 25
});

// Writing code to delete data
usersRef.child("-M0l6fudG0erJ74hKKw_").remove();

This is just one example of how to connect to Firebase using JavaScript SDK. The process may differ depending on the programming language being used, but the general idea is to initialize the Firebase SDK, connect to the Realtime Database, write code to retrieve, save, and delete data.