Are you using a wireless router, or are you plugging your computer directly into the WildBlue modem?
If you're using a wireless router, then your daughters' computers need to be configured to recognize that router and connect through it. If you're plugging into the WildBlue modem directly, then only one computer can connect to the Internet at a time, and they need to be plugged in using the cable.
Official WildBlue and Exede forum moderator
Please note I have changed usernames to "Exede Steve", and do not use this account anymore. Thank you.