CloudFlare is already activated for “jsmsr.com” under a different account. If you want to enable CloudFlare through this partner, please log in to your CloudFlare account and choose “Disconnect” on your CloudFlare DNS Settings page.
As the text saying, this domain is registered to another account. You need to disconnect it from that account before adding it to your new one. If that account is not accessible, contact support directly other than post the issue here. (https://support.cloudflare.com/hc/en-us)
Here is the Chinese version:
@allen_st_clair 's link lets you create a new ticket. The First response is usually automated. Just reply to it