Thanks for quick reply,
I am not able to open the port 81 as there is no info about the same.
Also I am using SSL on my website, will I be able to follow this tutorial?
These are the steps I am stuck upon:
--> Open port 81 in the server firewall.
--> Check if your website is being served properly by Varnish ™ on port 81 by adding :81 to the domain name in your browser.