If you are a customer of TMDHosting you can easily manage your DNS settings via your client area > My services > View/Edit button to the right of your account/product.
The DNS records will be listed along other useful data related to your account. You can also check our Getting started guide

You can always use this online tool to check your DNS records whether your are TMDHosting customer or not. For any questions/issues with your DNS settings you can contact your host/registrar for assistance. TMDHosting has long experience with dealing with various domain related issues and our support team will gladly assist you on any questions you might have.