Open this tab on a separate screen. It will be easier to follow along. :)
Text is mostly WYSIWYG - controlled via the format bar above, except for the body copy and headers.
You can link to a document while in this editor.
To make a button
At the top of this window, you'll see "Quicktabs".
Click on it.
You'll see the quicktabs editor. It is the same editor with the same features as this page.
Test test test!
Just like a regular page.