Domain in Dreamhost, hosting elsewhere, how to configure email?

Hello I’ve been trying to set this up for a while but I can’t quite get my head around it
I have a domain ( at Dreamhost as DNS only. Hosting is at OVH.
in this page
it says I can set up a forward-only email address, but I don’t find that option anywhere. Does forward only not work with “DNS only” domains?
If so should I input OVH’s MX servers and handle it over there?

From what I can tell, you’ve already set that domain to use OVH’s mail servers, so you can’t create any addresses from our Panel. You’ll need to set it back to DreamHost’s mail servers to do that.