Before you begin, ensure you have unique names and emails for everyone in your group. It is required by the registration system.
On http://www.childrenspastorsconference.com/, click "register".
Enter the name & email address of the "group administrator". (this is the first person of the group to be registered)
Follow the system to register yourself (or the first person/group administrator).
Towards the end, you will see a "register another" button, press that and repeat the process for each member of your group.