Help Nameservers isnt working

Good day. i have a problem on how to link my domain to my server. i have followed the steps in here
http://www.directadmin.com/forum/sho…228#post230228

HTML Code:

but it said i need to Tell DirectAdmin that these will be the primary nameservers: my nameservers are : ns1.couchtuner.eu & ns2.couchtuner.eu


but then i dont know how to

Edit /etc/named.conf

in SSH

hope you can help me with this

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