You can only have access to the DNS zones on a reseller account. You must upgrade to Reseller to have that access, or you can let us make the change for you.
Reseller: Go to WHM and click Edit DNS zones, under DNS Functions.
If you don't feel comfortable, we can help make the changes for you and confirm that your other DNS settings are correct.
It is important to check the NS records and make sure they match exactly the nameservers you are using at your domain registrar. If they are not an exact match, your website may experience intermittent downtime.
How do I check? Please go to WHM and, under DNS functions, click Edit DNS Zone. Select the domain name having problems and hit the Edit button. Look for the records that say:
domainname.com. 86400 IN NS ns1.hostgator.com. domainname.com. 86400 IN NS ns2.hostgator.com.
The last part of each line is the value which must match. If you have decided to use your own private nameservers, then these records should be changed to show those private names. (Also, in the DNS zone, these values must have a dot/period added at the end, as in the example.)
Here is some information to help you understand DNS zones.
Your name servers' job is to find the server and correct DNS zone in order to get the following information.
The NS records in the DNS zone must match the nameservers you are using.
The A record points your domain to an ip address. (e.g. mydomain.com -> ip address)
The CNAME record points your subdomain to another domain name, like www and mail. (e.g. www.domain.com -> domain.com)
The MX records control where your emails are received. If you want your mail hosted on another server, then this is what you will need to change. (e.g. domain.com -> server)
CNAME: A: You will make these change?