XAS OVERDRIVE

I wonder if someone can teach me how to activate the overdrive for the male character, i tried many things and explore the script all i can do is to put the overdrive at him but since my experience is narrow, i cant figure out how i can activate it on him. i followed the instructions there and still no luck.

Here is the link i can provide to XAS ABS: 

http://www.rpgmakervxace.net/topic/18602-xas-abs-english-script-fully-translated/

this is rather simple this is simply two button you push

But if you put the overdrive into the male character, it wont work, coz i know there is complication with the shield and charge attack of the male character, that's my problem.