Hi there Paul and welcome
Can you follow the instructions here please.
What is gets you to do is connect to the printers own wifi network then you can connct it to the Asus wireless network. So use a laptop or smartphone, disconnect it from the Asus wireless and connect to the printers.
You want to choose WPA2 and you should have set the password ***** whrn you set up the wireless network again
Instructions are here
Let me know please how you go.
ok, what you need to do is connect to that wifi network on the Mac, so join it like your joining any wireless network.
This is what is meant with disconnect from it.
ok Paul, No problem. Opting out