CME Huntgroup with line appearance

[Bucky101]

Hi All,
I have managed to setup a dymanic huntgroup exactly the way I want it. Users can press HLog to login and out of the huntgroup.
My question is, how do i set one of the buttons as an appearance, so when a huntgroup call hits a phone, it flashes and rings on labelled button. Below is the setup for the HG, 7799 being voicemail.

ephone-hunt 1 longest-idle
pilot 6000
list 7770, 7771, 7772, 7773, 7774, 7775, 7776, 7777, 7778, 7779, *, *, *, *, *,
*, *, *, *, *
final 7799
max-timeout 45
timeout 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5
hops 5
no-reg pilot
description IT Hunt Group
display-logout Logged out of IT Hunt Group
present-call onhook-phone