how to program usb host shield

hello im working on a project and i need to utilize the host shield. but the problem is i can’t and not only dat i am trying to add the codes for the host shield found from this project for witch you can find the codes form GitHub - moyuchin/WiiRemote_on_Arduino: Wii Remote, Arduino, USB Host Shield, Circuit at home the codes i need are usb.cpp and usb.h, wiiremote.cpp and wiiremote.h so can someone please help me on how to upload those into the host shield.
thank you for your help

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