I've been learning Linux with Ubuntu 18.04 but recently I wanted to try out a different desktop environment compared to GNOME. So I decided to run a Live version of KDE Neon 5.16.0( released 13 June 2019 ). After playing around with the panels and pre-installed applications I wanted to create a user account for myself with administrator privileges. But it seems that I can't escape being a Live session user. User Manager doesn't seem to save my new user details after I click Apply. I also tried rebooting Neon just to see if that would work but to no avail. It would be nice to have a static user account so I can save my progress, because every reboot seems to just be a refreshed Live session user account. Apologies if I'm missing something obvious to KDE environments.
Following commentary above, indeed because of it being a Live usb the changes made to it will not be saved when it's shut down and not powered. As such the Live edition will also not be able to create new accounts because it is limited to Live User Session profiles for testing purposes.