Asus Collection pen compatibility

[Markos]

I borrowed an Asus Collection pen which could/should be working with the Surface Pro (3). It has N-Trig hardware and according to this page, Surface Pro Pen Compatibility / Interoperability FAQ, it's mentioned it should work. However, I can't get it to work, because I don't see how I can pair it with my SP3. Just using it on the screen it does nothing (apparently on the Asus you just use it and it will work)