[ossec-list] How to delete already presented agentless host?

[ant's]

I'm very new to this tool. I added some host using this :

 /var/ossec/agentless/register_host.sh add root@x..x.x.x.x

Now for some reason I wish to delete that entry for that host. How I can do 
that?

I'm using Ubuntu Server 12.04