sorry for bad english. if renewing cz.cc free domain is free then what do mean renewing domain after two years? (why we should renew for free service when it is free?)
closed as too localized by danlefree Sep 14 '12 at 6:53
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Based on what I can make out from your question:
1) They might have given you free domain for only 2 years and after two years they expect you to pay fees to continue.
2) They want to make sure you are using your free domain (it is active and not just lying there). Hence maybe they want you to manually "renew" even if they don't want any fee.
(They => the company that gave you free domain).