This article will give you a step by step guide on how to install SquirrelMail from your cPanel. Sign into your cPanel and follow these steps:
1) Click Softaculous.
2) Scroll down to Mails. Find the SquirrelMail link and click on it.
3) Click Install.
4) Fill out all of the boxes. For In Directory type the name of a new directory you would like created. By default, the box will be left blank to install the software into your main directory. When you are finished, click Install.
5) You will then get a confirmation page of your installation.
This concludes how to install SquirrelMail from your cPanel.