how to create a subdomain

[samuel491]

on an website managed with parallel on a windows server

I would like to create a subdomain and display it in the browser

the operations I have done are:
menu: Websites & Domains >> Add New Subdomain
name: mysubdomain

menu: Websites & Domains >> DNS Settings
Switch On the DNS Service

if i try to navigate with the browser to mysubdomain.mydomain.fr got the message page not found

thank you for answers