How to insert the MailChimp form after Post?

Hi Vishesh,

I wrote a post about that on my blog: Add MailChimp sign-up form to end of all posts.

Basically, it comes down to adding the following lines of code to your theme its functions.php file.

function mytheme_add_signup_form_to_posts( $content ) {
    if ( is_single() && get_post_type() == 'post' ) {
        $content .= mc4wp_get_form();
    }
    return $content;
}

add_filter( 'the_content', 'mytheme_add_signup_form_to_posts' );

Hope that helps!