How do you find your own network security key?

Depending on the router, it could be written on the side. (This is the case for most 2Wire routers.) Otherwise, you can open your browser > type in your routers IP address (usually 192.168.1.1 or 192.168.1.254) login with your credentials (sometimes the default is "admin" with the password:"admin".) and attain it here.