Go ahead, look. It’s not there. I recently installed Windows 8 on my work laptop and needed to add a manual wireless connection for a client. Adding the connection works just as it did in Windows 7, no problem. I missed a setting when I set up the connection, though, so it didn’t work and the connection wasn’t listed in Windows 8 list of available connections for me to modify the properties. I needed to access what used to be the Manage Wireless Networks screen to modify the properties and get it to work, but since that isn’t available I did some searching on command line tools for managing wireless networks.
Although I didn’t find a command to magically open the “Manage Wireless Networks” screen (thinking it may still be on the OS just not linked to anywhere), I did find some commands that helped me thanks to a post on Windows7Hacker.com.
To list the profiles and see if the one you need to access is there, run the following from a command prompt: netsh wlan show profile
To delete a profile so you can manually enter it again, run the following: netsh wlan delete profile “Your Profile Name”
Now you can again manually create the connection, this time choosing the right settings (in my case :)).
Another option would be to delete the wireless adapter and re-add it, but that removes all of the profiles so you need to re-add everything you had configured previously for other networks.