Is this really the version you are looking for? Kentico Xperience 11 Documentation is no longer updated. Use the switcher in the header to choose your product version.
Editable region controls create sections of pages where editors can fill in content. The controls provide editing functionality when the page is viewed in the Kentico administration interface on the Page tab of the Pages application, or in on-site editing mode. After a user enters content, the controls display it on the live site. The controls are only compatible with Kentico ASPX page templates.
Note: To add editable regions on Portal engine pages, use the Editable text and Editable image web parts.