Need to know my security key

[Gretabird]

Hello,
Have company visiting & they need to know my security keypassword to log on to their wireless computer. How do I find out what it is:

 

[Emerald]

http://www.tomshardware.com/forum/31382-43-find-security-password-wireless-router

 

[Daal]

Hello,
Have company visiting & they need to know my security keypassword to log on to their wireless computer. How do I find out what it is: