I wanted to dual class my kensai to kensai/mage, but the dual class button never shows up..(I'm human) Is there something you need to do in order to activate it? Thanks

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<font color="silver"> As for ur problem, I dont think A kensai can dual to a mage... it needs to be a legal multi class aswell...
But I have heard of the game allowing this one, so Its probably to do with ur stats you must have at least 17 in the Prime Requisite of ur Current class (Strength i think for a Kensai) and at least 16 in the prime requisite of ur other class (intelligance for a mage). If u meet these criteria, then I have no Idea. </font>

AFAIK, SookmaCook is wrong on two points here. Kensai can dual to mage just fine. It doesn't matter if you have a kit for your first class. Fighter/mage is a legit multiclass combination, so fighter/mage, kensai/mage, berserker/mage and even wizard slayer/mage are all legit combinations for dual-classing.
As for prime requisites, IIRC those have to be 15 for the starting class and 17 for the class you switch to. So in your case, you'd need 15 str (and maybe con as well) and 17 int.