You need to use sudo to run mkdir on the root folder on any linux version:
sudo mkdir somedir
Enter the root password when sudo prompts for it.
Question
I need to know how its done. Do I need to be a superuser/ admin user? Do I need a root password I only have one user onthe pi if that helps
La solution
You need to use sudo to run mkdir on the root folder on any linux version:
sudo mkdir somedir
Enter the root password when sudo prompts for it.