I see another guy use noVnc making a webshell for linux, it's not graphic and its running level3 as in the picture below. Does anyone know how to run vncserver in level3?
It doesn't matter if you are on run level 3.
You can start a VNC server, using the vncserver service, and connect to it remotely. Your session will be graphic.
If you want to connect remotely to a shell, you can just use ssh instead.
You can use this link http://wiki.centos.org/HowTos/VNC-Server
That explains how to do it.