It's a matter of your taste so just be sure to add small incremental amounts until it suits your taste buds.
I need to do this one again. I have some 'skeeter pee' that I'm considering mixing with a wheat, but not sure it'll be anywhere as good as the orange.
Bottled: Am. Amber, ESB, Oat, JC Dubbel, Behemoth Imperial Stout, Wee Heavy Scotch Ale, Lefty Vienna Lager, Hefeweizen, Sm. Barleywine, Sm. Porter, Dunkelweizen & Helles Bock, Nut Brown, Cream Stout
Kegged: Trippel, Cream Stout, Belgian IPA '13, Nut Brown Ale