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I would like to give you a step by step but don't have a 7C so would probably just confuse you. The 750 is a very easy gyro to setup. I believe the 500 is considered a "large" heli by the gyro. So if this is true then you can just plug in the gyro with all the defaults and use as is. All you need to do is assign your gyro gain to the gear or AUX channel (JR terminology) and set the appropriate gain value and you are good to go. Of course, this presumes you have setup your tail correctly. Sorry I couldn't be of more help.
even not doing anything would have been better than nothing...