Activate a LED in my ESP8266-12E

With 8266-12E I managed to make a small circuit that shows temperature and humidity in Blynk. It works very well.
I also want to turn on an LED (later it should be a relay) by pressing a button in Blynk, but has encountered problems. In Setup, I can choose Virtual or Digital - I select Digital, but here’s the problem: Under Pin it shows gp0 to gp16. How does this refer to the physical pin on my board?
It is not clear to me if I am missing something in the programming or what I have overlooked or misunderstood.
No need to tell that I am new to this!!!

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Thanks for a quick answer. My problem is solved - it was confusing that (in my case) pin D1 was GP05.