Trying to install IFTTT nodes in node red

Hello. I am trying to install npm install node-red-contrib-ifttt in my hassio host. I can log into the terminal through putty as root. I cant install anything. I always get command not found (even with sudo). I cant seem to get out the root directory (core.ssh) and the command line is preceed with ~# instead of $. I have searched extensively for a solution, but I’m not able to find one. I will be very happy to get any help on this.

Thanks,
Mike