Turn on self-service site creation

• 
  

  Create a site collection (SharePoint Server 2010)

   self service site
  with the Service account.
  

• On the SharePoint Central Administration Web site, click Application Management.
  
• On the Application Management page, click Manage Web Applications.
  
• Click the Web application for which you want to turn on self-service site creation. The ribbon becomes active.
  
• On the ribbon, click Self-Service Site Creation.
  
• On the Self-Service Site Collection Management page, configure the following settings:
  
  • self-service site creation is On (enabled)
    

Click OK to complete the operation