In the Database section, select the "Create new database" option.
In "New DB Name" give this database a name of your choosing. Example: mynewwebsite (no spaces, lowercase).
In the "Domain" section enter a name for your site in the "Subdomain:" field. Typically, this name will match closely with the database name you selected and become part of your localhost URL. Example: mynewwebsite (no spaces, lowercase).
Click the "Import" button. Dev Desktop will import the site and open a web browser with the Drupal installation screen.
On the database configuration page you will need to fill in the following information:
Enter the database name you just created in the Dev Desktop settings.
Enter the database user as root
Leave the database user password blank
Click on the Advanced fieldset to expose more options