okI have instructions from Optus to change the wifi channels but I am imposed with a username login.
Have tried absolutely everything and nothing lets me in.
OPtus are crap! They didn't mention this?
@Mick335 which modem do you have?
click on the advanced setting
for the 3864AC try adminptus
for the 3864v3AC try optusdefault wifi passphase located at the bottom of the modem)