How to manually install packages for an app?

Basically I;m trying to install steam and the package manager asks for my sudo pw to install 3 packages. but for some reason i cant type anything on the command line but i CAN open a new termina and it works fine.

You’re doing this for the challenge? (Steam is in the software boutique)
Anyway, please confirm that you are aware that when you type your password in the terminal, no character (no star) is echoed back to you as you type.