Edit errors on login and lost password screen in wordpress

you can change the message in login screen by using login_errors filter hook, just paste this code in the themes functions.php file :

add_filter('login_errors','login_error_message');

function login_error_message($error){
     //check if that's the error you are looking for
     $pos = strpos($error, 'incorrect');
     if (is_int($pos)) {
         //its the right error so you can overwrite it
         $error = "Wrong information";
     }
     return $error;
}

for registration screen error refer this codex page
https://codex.wordpress.org/Plugin_API/Filter_Reference/registration_errors