The google instructions are here..
The important thing to remember is that DNS changes take time to propagate. When you are making changes on the dreamhost side to CNAME and A records, those changes don't take effect instantly. The simple dumded down explanation is this is just how DNS works, and not something that's dreamhost specific. What this means tho, is that you can't test what you did in the dreamhost panel until later. Normally allow 4-8 hours for propagation, it might take longer tho (12?/24?).
If you're still having trouble after knowing that, then give us the domain name and we can give more specific help. DNS entries can be looked up with we know the domain name.