Download Putty which is a ssh free program. The language that is used to communicate commands on a Linux server is ssh. http://www.putty.org/
It is recommended that you change your server root password regularly, to avoid malicious login’s and please ensure that your password is lengthy and uses uppercase, lowercase and special characters in between.
1. Login to the server using putty using your existing password and login name (using your IP address).
2. Enter:
passwd
press enter and add a new password (please not whenever you enter a password your curser wont move and also not show anything – you may think its not doing anything but it is).
After you have entered this you’ll be asked to enter your new password in twice for confirmation. The next time you login you will need to use this new password.