how do i am install whm and cpanel

https://documentation.cpanel.net/display/68Docs/Installation+Guide

Greetings @towsinashik,

The link Woet provided should work for you. You can also install cPanel and WHM on the Linode by deploying a new Linode with our cPanel StackScript or by going through our guide.

Here is some additional information on our StackScripts.

-Preston

In case you hit problems with emails from your server being marked as spam, don't forget that if you're assigned a dirty IP address by Linode, it's up to you to sort it out and get it removed from RBLs.