We’re rewarding the question askers & reputations are being recalculated! Read more.
7 of 8 replaced http://meta.stackexchange.com/ with https://meta.stackexchange.com/

How do I add HTML to my posts using the editor?

Umm, I feel dumb for asking this, but how to I add HTML into my questions and answers with this editor? Sometimes it works for me and sometimes it doesn't...

I know about the faq, that the site uses markdown and there are allowed tags as well.