Commeting on pages works the same as commenting on a JIRA issue.
The same syntax works, and the same behavior as typical issue comments applies here.
You can mention users, reference other pages, use macros, or regular JIRA wiki markup.
To add a comment, click the "Comment" button when viewing a page.
Enter your comment into the text area, and click the "Add" button
add button + inline comments dialog
Editing or deleting a comment can be accomplished by hovering over a comment,
which will make the edit and delete button visible.
rendered comment with actions