Do I need to add a 802.1x profile to allow others to use my wifi?

Before I upgraded to Mountain Lion visiting family members were able to use my internet. Now some cannot even though I have given them my password. Do I need to add a 802.1x profile? Does this mean my router?

I cannot amend my initial post as I incorrectly described the display so here is an update.
As far as I have read and experienced with purchasing two such displays, this model came with a Mini Displayport to DVI adapter not a HDMI to DVI adapter.
I think I need an HDMI to Mini Displayport adapter so I can use the Mini Displayport to DVI adapter that came with the display.
Here is the display:
Apple Cinema Display 23-Inch Aluminum
The Apple 23-Inch Cinema Display (Aluminum) (M9178LL/A), is designed match the Power Macintosh G5 and PowerBook G4 models. It features a 23-inch (1920x1200) wide-format active-matrix LCD display with 16.7 million colors, 170 degree viewing angle, and a response time of 16 ms. It sports dual FireWire 400 and dual USB 2.0 ports on the back of the display.
Picture is here if link is allowed:
http://www.sellyourmac.com/mac-product-guides/cinema-display.html
http://www.sellyourmac.com/images/stories/mac-guides/apple_cinema_display_20_inc h_aluminum.jpg

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