Most of cpanels tools (like password protect directory, hotlink protection, ip banning, etc) are just little .htaccess code generators. Cpanel only provides you with... maybe 3-4% of what you can do with .htaccess

Heres code you can add to your .htaccess file that will redirect all http:// to https://
Although, as Bethers has pointed out, you don't need to it on your entire site, any page that uses SSL is going to load slower then a page without it (the whole encryption/decryption routine takes time to do)

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