resolution in Debian bigger then in VM

[Balex123]

Hey,

I am a beginner of Linux and stuff like that, but i have the following problem:
I am using Debian und i can not see the complete KDE-Desktop in the VM Window, so i have to scroll down to be able to see the taskbar, because KDE is "higher" then the VM window.

How can i change the resolution of Debian? Can i change it in VM or are there any kind of options in Debian? because i cant find them...

Thanks for help

[Perryg]

Have you installed the guest additions?

[Balex123]

well my problem is , if i click on "guest additions" nothing happened. you know i am a complete beginner, dont know anything about it

[Perryg]

This should help Howto: Install Linux Guest Additions + Xorg config

[Balex123]

i tried to do it but i received an error message: "user is not in the sudoers file."

hope that there is somebody who can help me

[Perryg]

Debian does things differently.

Type su then press enter. Then your password and enter.
You should then be at # where you can run the commands.
Once at this prompt you can skip the sudo that is in the HOWto.