Double-click the putty.exe file to start the program. For the hostname, enter sercon.onlinehome-server.com and then click the Open.
Enter your Serial Console username and press ENTER.
Enter your Serial Console password and click ENTER.
As you type, no characters will show on to prevent bystanders from guessing your password.
Once connected to your server, you will see a line listing the escape character such as Escape character is '^]'. followed by some output from your server. Press ENTER to access your server's command/login prompt.
Now you should see the login prompt or command prompt. If you are given the login prompt, log in to your server as root using the root password to begin making changes to your system.
For additional information, you may want to reference: