Thank you for your answers. I don’t know why it doesn’t stay pointed at dreamhost after I save the changes.
I think I’m going to try to transfer my domain to them, it might work then!
Then it is wordpress.com which does it. I believe they sell them through automatic.
I have and they redirected me to the wordpress support system…
Still not resolved but Dreamhost indicated me that it was because I couldn’t point the domain to them.