Log into https://my.snowdenonline.com.au using your account.
On the MY LICENSES page, you will see the products that you have access to. To manage the users who can access this license or to manage the user permissions click on the MANAGE USERS button.
From this screen you can also add any new users who need access to your license. To do this, enter the email address of the user that needs access to your licenses and press the + button
If the user does not have a Snowden account you will need to fill in a few details before the account can be created.
Removing a User
While in the Manage Users section click on the arrow on the right of the user and select "Remove User"
Adjusting the permission of a User
Also available by clicking on the arrow on the right of the user is "Grant access to manage users" and "Set as Primary User"