This video shows how to work with the ModSecurity plugin in cPanel.
Check out what is ModSecurity and why do we need it:
https://www.namecheap.com/support/knowledgebase/article.aspx/9542/22/what-is-modsecurity-and-why-do-we-need-it/
Where to log in to cPanel account: https://www.namecheap.com/support/knowledgebase/article.aspx/10233/2255/video-where-can-i-log-in-to-my-cpanel-account/
What to do if the website is down: https://www.namecheap.com/support/knowledgebase/article.aspx/9568/2194/my-website-is-down-what-to-do/#403
