Hi Eric
With Linux, the password does not show when you type, not even the asterix markers that you would see in windows.
Just type in your password exactly as you saved it, being mindful of capitalisation in the correct places, or if it is a full new version on a new card then the password will be 12345678 and you are advised to change this on the first run of the configuration file. When you type it in you will not see anything happen until you hit enter. If you got the password correct it will let you in, if not it will spit back at you and tell you it was "incorrect login"
This Linux is a huge learning curve for me too, not helped bu aged brain cells.
Regards
Alan