Not all input fields you can find in Skins - Content are connected to the header or footer layout. Or differently said, the header and footer code doesn't contain all handlebars from Skins. The code needs to contain the handlebar from the input field in order to display the content of the input field.
So they reason why you don't see the content from an input field is that the handlebar is not in the footer/header code. Contact your account manager or our support team if you need help to add the handlebar to the footer/header.
You can also add the handlebar to the code by yourself if you are familiar with the code.
You find some guidance here »