You can find some information in this thread: How do we optimize SEO and Meta with Write.as? - #2 by cjeller1592
But in general, we automatically populate all the metadata search engines need to display your blog nicely in search results, as long as you do things like adding titles to your posts.
You can also set your blog to “Public” if you’d like it to be discovered quickly by search engines like Google. But otherwise, you’ll want to make sure other sites link back to your blog for it to be discovered by search engines.