NitroFallOff

Please download this small plugin and open click Copy SystemID Or Copy ProfileID button and paste up click here

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Or if you dont want to download this plugin you can go In menu cinema4D

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Extensions > Tools > Export Licensing Overview..
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you can see your ProfileID( userID )
the format look like
"userid":"AAAA-BBBB-CCCC-DDDD-EEEEEEE"
your profileID its the green text color
you can see your SystemID
the format look like
"systemid":"XXXXXXXX"
your SytemID its the green text color