Below the procedure to create a new users and give a SSH access to it
0) Log as root on terminal
1) Create a new user :
useradd userName2) Create the password for it :
passwd3) Edit the file /etc/ssh/sshd_config :
nano /etc/ssh/sshd_config4) find the line :
AllowUsers root support5) Add the userName at the end of the line :
AllowUsers root support userNameThe SSH access is now enable for the userName
I hope this help