Security Key

[#1]

I wanted to connect a friend to my internet, but could not remember how to find my security key, does anyone have an answer for me?
"try looking under Wireless Settings in the router web interface" --- Where is this to be found?
"or if you have a PN router look underneath it" --- Is this the white box with the blinking lights?

[#2]

Assuming that you are referring to the wireless key - try looking under Wireless Settings in the router web interface

[#3]

or if you have a PN router look underneath it