Formatting the post Flarum

How do these formatting such as bold in posts here?

You can also use BBCode

This is also useful, as you can add the js files url to your website and flarum will embed it automatically.
http://assemble.io/docs/Cheatsheet-Markdown.html

If you want to embed this cheatsheet into your own flarum installation, create a post and insert this link:

https://gist.github.com/jonschlinkert/5854601.js