How do I get Edit buttons to appear for section editing a page?

They appear at the end of each “headline” section. If they're not appearing then check that:

• maxseclevel in local.php is something like 3, 4, or 5, depending on how deep you want section editing.
• you have at least three sections
• your pages are modifiable (ACL) by the users who are having trouble with section editing.
• and that the pages are not read only on the server.

Add $conf['maxseclevel'] = 4; to conf/local.php file to enable section editing up to heading H4

• Section Editing