How to add ssh key after creating droplets & Login Problems

Hi there,

I’m create ssh key following this tutorial. But when i’m set PermitRootLogin ‘yes’ to ‘without-password’ then i face “sudo: unable to resolve host 360webtemplates” these error and after exit for terminal then i can’t login in my server from my pc terminal and also can’t login from “Digital Ocean Droplet Console”. I’m try to reset my root password following this tutorial and got reset password. But when i’m using droplet console and try to login as a root and setup new password then showing me “Login Incorrect”. How i will fix these problem? Please help to solve this problem.

Thanks so much, Arafat