Welcome to Parallels!
If you see this page:
1. Please check your home folder path\directory. It should contain your web site.
2. Check your DNS settings. They should point to IP address setted in your plesk panel.
3. Try to restart your website by these steps:
1. Choose Websites & Domains
2. Choose your domain
3. Click "Suspend"
4. Click "Unsuspend"