From the HTML editor and several parts, such as the Navigation Buttons part, Weblog part, and User Photos Form part, you can use the Insert image button to select an insert an image from the Image Library.
Note: On your website, if the user clicks the Insert image button on the HTML editor, an Insert Image screen appears. From this screen, the user can insert an image and load or edit existing images. You can configure the user’s Image library, including image approval, on the Settings tab in Sites & settings. For information about Image library, see Image Library.