Go to public_html then click setting checkbox Show Hidden Files (dotfiles)
after crate new file add file name .htaccess
add this code
<FilesMatch ".(?:html|php)$"> SetHandler application/x-httpd-alt-phpXX
</FilesMatch>
where XX is the PHP version you wish to set. It can be 52, 53, 54, 55, 56, 70, 71,72, 73, 74, 80, 81, 82, 83 or 84.
For example: i need 7.4
<FilesMatch ".(?:html|php)$"> SetHandler application/x-httpd-alt-php74
</FilesMatch>
