Hi, thanks for using JustAnswer.com I am Cris and will be glad to assist you.
Do you have a laptop connected to your home WiFi? If so can you tell me the operating system?
Can you locate the wireless router provided by Comcast. Usually on the router there is a label which states the SSID or Wireless network, that would be the name of the network you want to connect to.
Then on the label either WEP Key or Network Key that would be the password ***** join the network. Can you let me know if you find this information?
OK, can we do a remote session so I can log into your router and find the info you need?