It sounds like you have some fundamental misunderstandings about what’s the difference between HTML, HTTPS, and a URL. I suggest you make an appointment with your class’s professor and ask some meaningful questions, especially as to how to upload the file to the server and how to figure out the URL.

As it is, your question has nothing to do with Notepad++ – Notepad++ is the tool you use for typing your code; it has nothing to do with the server, or figuring out the URL needed to access a file on your server.