Boy! Setting this up is tortuous in the extreme.
Finally found it here:
N80 setting for WLAN access point are (Tools->Settings->Connection->Access Points)
as opposed to the myriad other places it could be such as:
or the cryptic “Connection -> Access Points” as suggested in the unhelpful error message when you try and edit the WLAN details from Availab. WLAN
Of all the discussions on the net from bewildered users, this seems the clearest: