If you need to add multiple user accounts at once, you can import the user information in CSV (comma-separated value) format. Importing users is an alternative to using the add user account wizard, which adds user accounts at a time.
You can import up to 1,000 users at a time in CSV files that are up to 300 KB in size.
To import users:
When creating a CSV file, use these guidelines:
User1,pwd
User2,pwd,,firstname,,lastname,true,,,User 2 description,true
The users you successfully imported appear on the users page. Email messages welcoming the new users are sent to the email addresses provided for the users. These email messages are based on your site's email templates.