I have small problem with creating resource records in the DNS-DHCP console.

I create a zone and in this zone I need two NS records and one MX record.

This what I have:

ZONE: xxxxxx.yyy
NS ns.xxx.yyy

Now I need to create a second NS resource record and one MX resource
record. When I click on the @ and try to create this resource records I
get this error:

Error: E0128 Host Name must be entered.

I need this configuration:

ZONE: xxxxxx.yyy
NS ns. xxx.yyy
NS ns1.xxx.yyy
MX smtp.xxx.yyy

How can I fix this ?