In Windows 8 there is no way to remove a wireless netoword form the GUI. In order to do so you must use an elevated command prompt.
To open an elevated command promt, just press the WINDOWS and X keys together and then click on Command Prompt (Admin). Click Yes to the User Account Control message that appears.
To show all wireless profiles on the PC at the command prompt, type:
netsh wlan show profiles
To delete a profile at the command prompt, type:
netsh wlan delete profile name="ProfileName"
Pantelis Apostolidis is a Cloud Solutions Architect at Microsoft and an ex Microsoft Azure MVP. For the last 15 years, Pantelis has been involved to major cloud projects in Greece and abroad, helping companies to adopt and deploy cloud technologies, driving business value. He is entitled to a lot of Microsoft Expert Certifications, demonstrating his proven experience in delivering high quality solutions. He is an author, blogger and he is acting as a spokesperson for conferences, workshops and webinars. He is also an active member of several communities as a moderator in azureheads.gr and autoexec.gr. Follow him on Twitter @papostolidis.