SERVER : centOs with Plesk 11.5 - domain use wildcard via

SERVER : centOs with Plesk 11.5 - domain use wildcard via a dns config
1. I install wordpress and theme with multisite option.
2. I config it to use subdomain
3. its ok with wordpress but no subdomain created on the server.
Question : Someone know how to config server ? I can't do this because file dont exist on my server (plesk11.5) : https://codex.wordpress.org/Configuring_Wildcard_Subdomains_for_multi_site_under_Plesk_Control_Panel
I really need subdomain creation to works and earn money with WPMU
Thank you