Open putty and go to connection > Data
Provide username as opc
Go To Auth and upload the private key pair which was generated as mentioned in
Provide the public ip of the VM instance in Tunnels and port 5901 as mentioned below and click add
After adding it should look like this
Now save the session with public ip and name
If you try to connect you may receive this error. It says private key in old PEM format is not recognised
To change the format of the private key to ppk open putty key Generator and click load.
Provide the location of the private key and click open
Your private key is now imported. Save it in ppk format
Save private key and provide new name. I am not providing pass phrase but you can provide if you want extra security
Give the name
Now your private key is converted in ppk format
Lets use this one in putty now. Remaining settings will be same.