All HTML headings, <h1> through <h6> are available.

h1. Heading 1

h2. Heading 2

h3. Heading 3

h4. Heading 4

h5. Heading 5
h6. Heading 6

To use the headings just type the following code in your text editor. Make sure the code is added in the html mode.

<h1>...</h1>