All I want is a simple button to appear in the touch bar...

Hello, I have a license, and I have my settings as such:

All I want is a file to open once the icon is clicked. But I simply cant get the button to appear in my touch bar... As you can see in the screenshot it says 'your custom touch bar is currently hidden' From reading I really cant see how to make this happen...

Macbook pro 2016 15 inch.
I have sierra running.

You have configured the button only for Preview, this means it will only appear if Preview is active. Is that what you want to achieve?

Thank you Andreas for you reply. this is helpful and I understand what went wrong : )