Pls help with command promt at Volumio

Sorry for stupid question. I am new for Raspberry PI. I made downloaded image file to SDCARD, all is worked. But I want to making some exchandings, which I found at this site. But how to run command promt over Volumio WEB interface I have no idea. Please help

you can connect a monitor and a keyboard before you boot, then you can write all directly on the pi
you can use for example putty and login to your volumio

use this login data:
or if you want root access:

Thanks a lot!
I am using PyttY, connection is ok. But no one password dosn’t work. Either login: volumio or root. Password:volumio -assess denied