1. Download the CodeIgniter framework from the official website or via Composer.
  2. After downloading, unzip the file and place the CodeIgniter folder in your server's root directory.
  3. Open the application/config/config.php file and configure the base URL for your application.
  4. Create a new controller by extending the CI_Controller class, and define your desired methods within this controller.
  5. Create views for your application by creating .php files in the views folder.
  6. Define routes for your application in the application/config/routes.php file to map URLs to different controllers and methods.
  7. Use models to interact with the database by creating model files in the models folder.
  8. Load the necessary views and models in your controller methods and perform any required data manipulation or retrieval.
  9. Test your CodeIgniter application by accessing it through a web browser and ensure that it functions as expected.