To create a sub-account:
- Login with your username/email and password and go to the My Account section of the website.
- Click on the "Account Profile" link under the My Profile section.
- On the left-hand side will be a list of links. Click on "Create Sub-Account".
- Fill out the form for each sub-account you wish to create and select continue.
For a description of the two types of sub-account see here: http://support.elephantdrive.com/entries/58071-can-i-set-up-multiple-users-for-one-account