Umbraco needs to do a little more steps to add some content to a page and to a specific contentplaceholder.
- You need to edit the page template and add the zone that you wich to fill (in Settings -> Templates )
for example in the footer zone
<asp:Content ContentPlaceHolderID="F1_Zone25_1" runat="server">
<umbraco:Item runat="server" field="myTextField"/>
can insert other content fields or other content
- Now you need to edit in Settings -> Document Types and see in the attached print how to create the new content field
- Then go to tab Content of you page and you now have a new text field and set in other contentplaceholder.
- Now Click Save and Publish