dns not working

I registered for a domain name 10 days ago and eventually gave the dns details of my WHM to my registrar. However I did not park this domain name in WHM until I created an account for it. I created the account a few days ago but the dns is still not working which I find weird. Can it be due to the fact that I waited too long before creating the account and dit not park the domain until then ? How can I check if the problem comes from my dns registrar or from WHM ?