You should not use WebUI as root user! If this is your first time running WebUI, proceed through the setup wizard. Afterwards login using the global-admin account.
Hello {{user.givenName}} {{user.sn}},
use the sidebar to navigate through the options. You can start by using the Enroll module to subscribe to your classes.
Use the sidebar to navigate through the options. But keep in mind: With great power comes great responsibility!