DNS Management is a feature that allows you custom control of your domain names DNS settings. In order for this feature to work, you must have your nameservers set to the following:
Nameserver 1: dns1.name-services.com
Nameserver 2: dns2.name-services.com
Nameserver 3: dns3.name-services.com
Nameserver 4: dns4.name-services.com
If your hosting company has given you a set of nameservers to point your domain to your site, then your hosting company is managing your DNS and this feature of your domain name account here at TLC Web Enterprise is not something of which you can take advantage.
The DNS Management feature, if you are using it, will allow you to control the A, MX, CNAME, and other DNS records for your domain. This can be useful to point a domain to a particular site, etc.