Can you clarify what you mean by "...there is no pairing button..." please? Do you mean a physical pairing button on the UZB stick? There isn't any reference in the PDF to pressing a pairing button on the stick to join it to a hub.
Or do you mean that the Select Learn Mode button is disabled when you initially connect your stick to the PC Controller app?
A picture of your stick would be helpful...I have a UZB-7 stick (pic of mine below) from Silicon Labs and it works exactly as laid out in the PDF instructions. It's been recently updated to 18.1.2, but worked the same on all previous SilLabs Z-Wave FW versions. No one else has reported any issues w/the instructions in the PDF, using a wide range of UZB sticks.
Just realized - I hope we're referring to the same PDF. My references above were to the PDF found in this thread: