If you installed Magento with Softaculous, then the necessary .htaccess modifications will have already been applied to your site. But if you install Magento manually, then you will need to make the changes as described below.
Paths are given as /home/$USER/public_html/ where USER is your cPanel username. If your Magento install is located in a folder, please amend the path as needed to include the folder name(s).
Find the Line:
Options +FollowSymlinks
And change to:
Options +SymLinksIfOwnerMatch
Find
Options All -Indexes
AND Change to:
Options -Indexes
Find
Options +FollowSymlinks
And change to:
Options +SymLinksIfOwnerMatch