You can use nmcli to get info about networkmanager. Please post output of:
nmcli
nmcli g
inxi -n
@WalterCool posts some good suggestions. We need to know more that “I can’t get wifi to work”.
Did wifi work on the ‘Live’ iso before installation?
What have you done to get wifi to work?
Have you made any changes to your system after installation?
I do a lot of iso and install testing. My experience is that I boot a ‘Live’ OMLx iso (Cooker, ROME, or Rock) and connect to wifi first thing with the network icon in Plasma system tray. After installation wifi just works, so the config must be copied during the install. Normally a user should be able to connect with that system tray icon after install if for some reason that did not do so on the ‘Live’ iso.