In order to add custom DNS records to your DreamHost account, please do as follows:
1. Login to your DreamHost account.
2. Go to: Main Menu > Domains > Manage Domains.
3. Now go to: Add New Domain / Sub-Domain > DNS
4. In the "Add a custom DNS record to..." box, choose the record you want to add:
4.1 For A record: Choose type "A", enter the IP (that was assigned to your web site by Incapsula) in the "Value " field and click .
4.2 For CNAME: Choose type "CNAME", enter "www" in the "Name" text box field, enter the CNAME (that was assigned to your web site by Cloud WAF) in the "Value " field and click .
For further instructions, please review this article.