Use Numbered Headings

Apply Numbered Headings to your page

Create your page content.
Use the Heading styles to identify the headings you want numbering.
Publish your page.
Select the Numbered Heading Icon from beneath your page title.
Select the Enable Headings toggle.
(optional) Select the Number format you want to use. the preview tab shows you the differences as you select an option.
(optional) Use the Skip headings drop down to identify any heading levels you do not want to be numbered.
eg. Selecting Heading 3 means that all H3 headings on your page, will not be numbered.
Select Save.
Refresh your page to see the applied headings.