How change a user´s home directory?
 

How can I change a user´s home dir?

Let´s say Roxxor2´s home dit is /home/Roxxor2, how can I change it to /home/roxxor?

make sure the new directory is owned by the right uid with:

chown -R roxxor2:roxxor2 /home/roxxor #run as root

then edit /etc/passwd and change the line beginning with roxxor2. change the part that says '/home/roxxor2' to '/home/roxxor'

Thanks! Is it also possible to change the user´s name from "Roxxor2" to "roxxor"?

Yup. same place in /etc/passwd, just change the name.

I think it might be a bit more complicated for some GUI settings, but that's it for the basic login.