Occasionally tuning your DNS can be very complicated, and you should be extremely careful, when you use the domain to host your website, because you can delete it.
Thus, keep in mind, that despite of many domain registrars and hosting providers have similar ways of DNS attuning in general, they also have a lot of distinctions in particular.
The most important to know: DNS needs to distribute all over the World in order to make your domain work. Besides, keep in mind when the domain is new it can take maybe 15 minutes, but when your domain is long-time used it can take up to 24 hours.
Try to set up your DNS correctly and if you want to change your purchased DNS, send letter to support center. It does not matter domain of which type you are connecting. More information about domain types you can find here: