Now we need to add a Page placeholder web part that ensures loading of sub-pages (such as Home or News page) into the master template. There can be only single page placeholder web part in a single page template.

 

Switch to the Design tab and add the General/Page placeholder web part into the zoneMain web part zone. Click OK. You do not need to make any changes to the page placeholder settings.

 

 

Page url: http://devnet.kentico.com/docs/tutorial/index.html?adding_page_placeholder.htm