Final answer:
To change the username and password in Kali Linux, use 'passwd' for passwords and 'usermod' for changing usernames, ensuring you are not logged in as the user you want to rename.
Step-by-step explanation:
The question is about how to change the username and password in Kali Linux on a VirtualBox virtual machine. To change your password in Kali Linux, you can use the passwd command. Open the terminal and type passwd followed by your username. You'll then be prompted to enter your current password and then type in a new one.
To change your username, you cannot be logged in as the user whose username you want to change. You'll need to login as root or another user with sudo privileges. Use the usermod command like this: sudo usermod -l newUsername oldUsername. Remember to also rename the home folder to match the new username with sudo mv /home/oldUsername /home/newUsername