In a default installation, users must be registered and logged in to edit pages or page content.

Once logged in, a black triangle appears next to all content that can be edited given the current user's permissions. Registered Users have the ability to add and edit content on their personal page. Editable content includes sites, spaces, pages, and widgets (page components).

Clicking the black triangle will bring up a tabbed interface. The tabs correspond to actions that can be performed on the widget. Depending on permissions, an "Edit" action should be visible. Clicking this tab will display the contents of the widget. Make the desired changes, then click the Save button.