Login GUI with root user Debian Nanopi fire 2

nanopivn
Hi all,
Please tell me how can i login the Debian GUI by root?
wait your answer!

davef
Try:

   root
   fa

or 
   root
   123456789

nanopivn
Sorry :(. i mean that: i want to boot to Desktop Debian by root user,
because the default user is fa not root.