Declare the support for blogposts

    add_action( 'init', 'theme_review_init' );
    function theme_review_init(){
        /**
         * Claim support for the "Affiliate Product Reviews" plugin
         * 'ri' claims support for the plugin
         * the second parameter explains, whether the plugin is using regular posts ('post') for the reviews
         * or wants a CPT ('ri') to be registered by the plugin to use.
        **/
        add_theme_support( 'ri', 'post' );
    }