After you activate your hosting plan or add a new domain to it, you will see a page like this when accessing your website:
This page means that your domain was successfully added to the hosting plan, points to Hostinger, and you can start developing your website.
Before moving on to create your website, open Websites → Manage, search for File Manager on the sidebar and click on it:
There, open public_html. Right-click on the default.php file (it should be the only file present) and choose Delete:
That's it! Now you can start a website hosting journey, for that you can either:
Install one of the popular CMS, available in hPanel. We definitely highly recommend trying out WordPress
Upload your website's backup (if you have one already) by using Import Website, File Manager, or FTP
Create a migration request if your website is hosted elsewhere. Our team will gladly move your website for you!
You can also start developing a website on your own - for that, make sure to check a detailed overview of basic actions in File Manager