How to add labels to posts from c#

Hi ! I found a C# code that posts to blogger and i've been trying to my it 
add label too but i can't figure it out...  here's a portion of the code:

private void JSONPublish(string sid, string stitle, string scontent, string 
token)
        {
            var http = (HttpWebRequest)WebRequest.Create(new 
Uri("https://www.googleapis.com/blogger/v3/blogs/" + sid + "/posts/"));
            http.Accept = "application/json";
            http.ContentType = "application/json";
            http.Method = "POST";
            http.Headers.Add("Authorization", "Bearer " + token);
            http.UseDefaultCredentials = true;

            var vm = new { kind = "blogger#post", blog = new { id = sid }, 
title = stitle, content = scontent };
            var dataString = JsonConvert.SerializeObject(vm);   
            string parsedContent = dataString;

            Byte[] bytes = Encoding.UTF8.GetBytes(parsedContent);

            Stream newStream = http.GetRequestStream();
            newStream.Write(bytes, 0, bytes.Length);
            newStream.Close();

            var response = http.GetResponse();

            var stream = response.GetResponseStream();
            var sr = new StreamReader(stream);
            var content = sr.ReadToEnd(); }

i tried adding labels = "label" in it but it doesn't work... if you need 
the full code you can find it here:

http://csharp-tricks-en.blogspot.ro/2015/08/publish-posts-on-bloggercom-api-v30.html

Thank you for your help, have a good day!!!

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