How to point 1and1 domain to dreamhost?

I know this is probably an easy question…Anyways, I know I have to put the DNS servers for dreamhost into 1and1, but when I try to edit the 1and1 servers, the only opitions come up as

Primary name server (OK)
1st secondary name server
2nd secondary name server
3rd secondary name server

So Dreamhost gives us the Primary, Secondary, and Tertiary Name servers…where do I put the Secondary and Tertiary?

I’d set them as follows;

Primary =
1st secondary =
2nd secondary =


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