howto renew a domain

Can you tell me how to reregister my domain.

Domain renewals are done some different ways in different registrars (domain sellers).

Some of them do keep domain for 2 months, you can renew (re-register) domain with no additional cost,

Some of registrars, do lock domain, and wants some extra money for domain renewal..

I dont know specifically the seller of, how they behave,

you should login to your acount on your registrar, (where you bought rendokan) and look for renew somewhere there,

or just try to register domain rendokan, it may redirect you to a buy/renew page...

Ideally, you should not be too late for a domain renew, and renew it before it expires...

hope that helped you.