If you get redirected to dynadot.com, then that is usually a caching issue. You can try restarting your computer or visiting your domain without the www. to see the uncached website. Otherwise, the cache should expire in a day or so.
Also, since the domain is registered through us, you would select the Dynadot Hosting server selection instead of entering in the ns1 ns2.dynadot.com name servers on the name server selection page.