Raspberry Pi touchscreen size

I’ve set up Volumio OS 3 on my raspberry pi as a desktop Spotify now playing system using the now playing plugin/ touchscreen plugin. Only problem here being the screen im using, a 1920x1080 display 7 inch, is not scaling to the right size. When it boots there are black borders around the screen and image is compressed to a smaller size. How can I fix this? I don’t know how to access the terminal on this OS, or type anything. Any help would be great.

enable SSH
add to userconfig.txt

hdmi_cvt 1920 1080 60 3 0 0 0


Sorry I don’t mean to sound dumb, but what is the password to the ssh. I typed in “ssh player name@IP” and it asked for a password. I tried volumio, Volumio, volumio2, but nothing worked.

Use volumio@IP and password volumio.

thank you that worked perfectly.