There's one philips screw at the top. remove it. Then dig your fingernails in the edge of the light assembly (away from the ARB) and pull the thing forward.
I can't get to Christo's site from work, but suspect it says about the same thing? And probably how to wire the indicator lamp..
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 06 TW200, 89 TW200, 09 TTR125, 07 TTR90, 07 CRF50