Congratulations on the new domain name! There may be additional steps required to configure your new domain name. If you ordered your domain name along with your hosting package, it should already be configured for your hosting package and you will just need to wait for DNS propagation.
If you purchased your domain separately, it may or may not have automatically been associated with the correct hosting package. You can check by performing a WHOIS lookup to query your domain name's settings. The WHOIS results will contain the currently configured name servers.