Official LaunchRock dns pages:
http://launchrockhelp.uservoice.com/knowledgebase/articles/137677-dreamhost-a-record-instructions
http://support.launchrock.co/knowledgebase/articles/36672-dreamhost-a-record-instructions
http://support.launchrock.co/knowledgebase/articles/36673-dreamhost-cname-record-instructions
On the Dreamhost Side:
From the panel, Go to your Manage Domains Page and make sure the domain is DNS only. If you have hosting on the domain, use the “remove” button under the “web hosting” column:
Once the domain is dns only, click the dns link under your domain name and add these records:
Custom DNS Options:
Name: subdomain, leave blank for naked/root domain
Type: type of dns record, such as A record, Cname, TXT
Value: Target
Settings Needed for this setup:
Name: leave blank for naked/root domain
Type: A
Value: 54.243.190.28
Name: leave blank for naked/root domain
Type: A
Value: 54.243.190.39
Name: leave blank for naked/root domain
Type: A
Value: 54.243.190.47
Name: leave blank for naked/root domain
Type: A
Value: 54.243.190.54
Name: www
Type: Cname
Value: host.launchrock.com
Note: This guide has been created to help simplify setting your domain up. The service you are pointing your domain to, DNS can/might has changed. Always check the hosts official page to verify the records.