The domain whois info does show that you own the domain. http://www.networksolutions.com/whois-search/jeniseparris.com (many registrar's have whois servers to look up information about a domain... I just happen to use Network Solutions most often.)
The first thing to do is find how to changes nameservers for the domain to
This will be done on the vistaprint side, or possibly a tucows.com site since they are listed as the official registrar.
Once this change is made the next step is to wait for DNS to propagate. This may happen in 12-24 hours for US users, but may take 3 days to be seen completely worldwide.
Later you can transfer the actual domain registration to dreamhost if you desire, but the first step is just change the nameservers for the domain.