Submit your website sitemap to Bing Webmaster Tools so that it can be reliably indexed. Bing doesn't have your website yet.

Bing/Yahoo are much slower with indexing/ranking sites, its much quicker to build backlinks to your site rather than submit to search engines for indexing. If a page doesnt have backlinks all search engines see it as not important.

Hi GaYoon, there is really no need to submit your blog to search engines. As they crawl the web and the links, they will index your website accordingly.

Even if you submit your blog to them, all you are doing is actually getting your website into search engines, which do not mean that your blog will rank for keywords. Thus, you won't be getting a lot of traffic too.

Yahoo and Bing tend to take longer to index websites as compared to Google. This is also the case if you are trying to rank for certain keywords on these search engines.

Hope the explanation above helps.