Flarum, the used forum software was just updated to the latest version, Beta 6.
A lot has changed for the forum admins & moderators, for you as user there is the addition of using the "Quote" option by just highlighting a certain part of text and a pop-up will appear to use this new feature.

Expect more editing options to come with the next release.

7 days later

Markdown editing tags are now included, just start writing a post or replying and you will see the new editing options.
Code tag is not visible yet, though the shortcut for it works:

Ctrl-Alt-c