Below are the steps how to get for free renewal domain name on CO.CC:
1. Sign in to your account at CO.CC
2. Choose a domain name in experied who want to extend more active period
3. Click Renew
4. Select / Personal check (renewal fee: $ 0/year), check also lower
5. Click Continue
6. Done. Wait in the 1 × 24h domain / blog you will be loaded again as before
For screenshoot, please see below:

If you don’t have account on CO.CC or maybe you want to get one or more domains from CO.CC, you can …