Looks like you are talking about a browser game.
Creating an account and handling data on server side is out of the scope of Construct.
Construct can help you with a client that will make it "nicer" to retrieve the data, display them, allow the player to have some interaction and send those interactions to your server.
You will need a database, and handling an account system and scripts that will handle your games' interactions.
From Construct you will likely need to retrieve and send informations from/to your server's database, by connecting to a dedicated server-side scripts using AJAX.