Raspberry pi 5 su password

Good evening, I downloaded and burned the latest raspberry pi 5 image and have run into a couple of problems.  The user "cnc" password "cnc" lacks root access and only has read access to the etc file.  Is there a SU password for this latest image.  I need to make some changes to the etc /network files as there is no apparent network manager showing in the available applications.  Thanks!

Just use .

If you want you can install then reboot

None of the Linuxcnc images and ISOs install a root user so sudo is required
Sometimes I do: sudo su
which gives you a root access (you will see the prompt change) untill you type: exit