Your vnc details and password was sent to you when you have re-installed vps . If you have no idea of vnc details , just contact our support team .

We recommend tightvnc which you can download from here https://www.tightvnc.com/download.php
After installing tightvnc, search for the tightvnc viewer in pc and open it

Use the vnc details in tightvnc viewer and click connect

Enter your vnc password and click ok

Now you are connected to vnc viewer.
Note that your vnc details and password are different from root/Adminisrator login information.