It depends on your choice.
If you want you can either park your domain to 000webhost or point it with CNAME records. If you point it with CNAME records you will still be able to use your registrar for DNS settings. Also, for CNAME pointing you'll need to keep your registrar default NameServers.
If you park it using Name Servers then you will be able to use only our limited DNS management (which allows you to add only one MX record).
It depends on your choice. However right now your domain is parked correctly. Unless you need more control, keep it this way