Depending on the domain management company, there are cases where only 2 - 4 nameservers can be registered.
Please be assured that it will work even if all five nameservers are not set.
*If only two nameservers can be set, set nameserver 1 and nameserver 2.
For information on how to check the nameservers of the server you are using, please refer to the How to check nameservers article.