Google is your best bet, appending the magic words "manual pdf" to the bike make and model should provide results.
Hope your not having problems and just want the details to help maintain the bike.. but..
If your having problems with the bike, take photos of it and post them, aspects of interest are the headset/display and its connections, the controller and its connections and any aspect providing you with a problem. there are some folk in here with all the necessarily knowledge willing to help but no one knows every bike so showing us the issue is crucial if aid is required.