in addition to adding the input field to the Edit and Insert controls on the admin side, you also need to add the output label to the SingleNews (assuming that's the view you're using, there is also a ListPageDetails in the Modes folder). Assuming you called the field URL add a Hyperlink control and make sure that the ID matches:
|<asp:HyperLink ID="URL" runat="server" /> |
if i recall correctly the sitefinity system should automatically locate this control and fill it with your field. if it doesn't, be sure that you also added this field to the web.config file as an extra metafield:
| <!-- other fields --> |
| <add key="News.URL" valueType="ShortText" visible="True" searchable="False" sortable="False" defaultValue=""/> |
i hope that this was helpful!