Netgear 80 Authentication problem

It's R6220-100 NAS (AC1200) Netgear 80 Router. I have a new tablet which works fine w/my regular internet provider but downstairs I need to use the Netgear connection. I keep getting the message "authentication problem" & it won't let me enter the password. There is no problem w/my old tablet (password was entered when I bought Netgear in 2016). For some reason I can't get the "password" prompt. Any ideas would be appreciated. - As to the tablet, I have had no problem with passwords/connections in Florida or here with the regular internet from our provider.