How can I change the screen resolution?

I'm running Tails. - Can't use the settings menu to do it, there's only one option there and it's like 600x800 which is the problem, I think - Can't figure out what the display name is for my monitor, have tried using w but it tells me my console's not wide enough to do it. I cannot make the window bigger because of my screen resolution. It already looks huge. - All the solutions I've found involve using xrandr, but I need to know the display name of my monitor to do them. I have run out of ideas.