thaks for reply, but when i try to do this i have this error message: The name server 'ns1.domaine1.com' already exists. The name server 'ns2.domaine1.com' already exists.
and when i try to change name server's domaine2.com by ns1.domaine1.com and ns2.domaine1.com i get this message error : One of the name servers you submitted does not exist; please check the spelling and try again
Notice: domaine1.com and domaine2.com are in different account dynadot.