How would I add iCade(bluetooth) controller to unity project for Iphone?

I have a very basic iCade controller (which the phone and CPU recognizes as a keyboard) I would like to use this as a joystick for my project when exported to iPhone.

Would be very thankful to the best way to do this. There are some scripts online that I have downloaded that are supposed to do this, but since I am new to Unity I don't know how and where to apply them once imported into my assets.

Very thankful for any help.

Cheers,

George