I found the way
just add the following codes in wp-user-frontend/wpuf-add-post.php
1.below this code “””””do_action( ‘wpuf_add_post_form_tags’, $post_type );
wpuf_build_custom_field_form( ‘bottom’ );
?>”””””
add this
<?php
require_once(‘recaptchalib.php’);
$publickey = “your captcha code publickey”; // you got this from the signup page
echo recaptcha_get_html($publickey);
?>
2.below this code “”””//validate title
if ( empty( $title ) ) {
$errors[] = __( ‘Empty post title’, ‘wpuf’ );
} else {
$title = trim( strip_tags( $title ) );
}”””””
add this
require_once(‘recaptchalib.php’);
$privatekey = “your captcha code private key”;
$resp = recaptcha_check_answer ($privatekey,
$_SERVER[“REMOTE_ADDR”],
$_POST[“recaptcha_challenge_field”],
$_POST[“recaptcha_response_field”]);
if (!$resp->is_valid) {
// What happens when the CAPTCHA was entered incorrectly
die (“The reCAPTCHA wasn’t entered correctly. Go back and try it again.” .
“(reCAPTCHA said: ” . $resp->error . “)”);
} else {
// Your code here to handle a successful verification
}
to get your captcha code vist this https://www.google.com/recaptcha/admin#whyrecaptcha
To get Captcha do the following things and also install wp-recaptcha plugin