Connecting to wireless router

Hello,
I recently installed a wireless router for my family, so they can use their laptops in other parts of the house. I connected it to the main computer that has a broadband connection. When I tried to connect my notebook to the internet, I chose a new network. Now, only my laptop can use the wireless connection. I can't figure out how to undo it so that others can use the connection as well. Is this just a sharing issue that I can control? or did I connect incorrectly? New at this pc stuff. My husband usually did it.
Thanks!
T