[Suggestion] :
The unexpired servers do not support to click the “renew” button. You could see that the “Confirm Order” button is in grey.
If you want to prolong the cycle of the instances, you should go to route: console- Elastic Computer Service-instance –renew and confirm your instance is auto renewed.
The “renew” button is only for the servers which has already expired but still do not released, it is only for emergency use, thanks.