The Quick Draft module located in your dashboard is an easy way to quickly write out your ideas for a post and save it as a draft to refine later. Simply type in a title and add in your post content. When you are done, click Save Draft. This automatically adds it to your drafts, which you can access by going to Posts and then All Posts.
From here you can continue to edit your post in the post editor as well as add tags, categories and media and then publish it to your site.