Thank you for your answer.

This is the text on top of DNS's page.

dns_rdata_fromtext: /dev/shm/bind/DO/db.carscx.com:15: near eol: unbalanced quotes
zone carscx.com/IN: loading from master file /dev/shm/bind/DO/db.carscx.com failed: unbalanced quotes
zone carscx.com/IN: not loaded due to errors.

There are new image

http://s22.postimg.org/lzdmsplwx/digital_ocean.png

I want to have two subdomains mail.mydomain.com and iredadmin.mydomain.com

Thanks for all.

Your subdomains look correct (from what I can tell) on that second screenshot. I'm having the same issue where I add a subdomain and it never seems to propagate. I filed a trouble ticket this morning and they confirmed there's an issue and it's been escalated to the engineering team. I would hope that one the issue is fixed, it would be fixed for everyone, but you may want to file a ticket just in case.