A Blog is an excellent marketing and advertising tool. Blog posts will keep your website visitors informed and can help with SEO (Search Engine Optimisation), as it is usually an area that is updated frequently with relevant text and content to your field of expertise.
The blog feature is automatically enabled on all new accounts. To ensure this option is active, you can navigate to the Blog > Settings area of your admin account and check that the Status radio button is set to On. If you don't intend to use blog you can disable it by changing the Status radio button to Off.
Once the blog is enabled, you can head to the Blog > Posts area and create a new blog post. The instructions on how to set up a new blog post can be found in this link.