This is a sample post so you can see how writing appears on the site. Delete it once you have written your first real one.
To add a new post, go to /admin/, click Blog posts → New Blog post, fill in the title, date, category, tags and body, then hit Publish. The site rebuilds itself and your post appears here within a minute or two.
You can write in plain language. Headings, bold, italics, links and lists all work, just like a normal document editor.