
Rarely flying into an airport without a tower or ground frequency, I found myself a bit stumped when that happened today. ATC said 'contact approach on...", and in that case, it seems that the VCP in Mode 2 does not change the frequency, so I did it manually.
But what key combination (keyboard; my PF3 hotkeys are custom, as the defaults clash with other mappings in X-Plane) do I need to then press to make contact with Approach? I tried at first the same key as I'd use to contact tower (though as I am in Mode 2 mostly at that stage, it happens via the VCP), then a couple of other possibilities, hotkey-wise. No reply, so I guess I was doing it wrong.
No doubt the answer is in the pdf somewhere, but I haven't been able to locate the answer ((searched for the term 'approach', and read the VFR section).

Thank you.