# adding user
adduser USERNAME

# give password for the user
passwd  USERNAME

#adding use to WHEEL groups to give usename to sudo 
usermod –aG wheel USERNAME

# we have to edit file : 
# /etc/ssh/sshd_config
AllowUsers USERNAME

# to have to restart sshd service.
systemctl restsrt sshd

# if adding to WHEEL group is failed do.
# open the file /etc/sudoers
visudo
# find       root ALL=(ALL) ALL
# and add    USERNAME ALL=(ALL)
# save and exit