DNS problem with IP

We have a set of servers (3) with a particular provider. The primary nameserver is running off the first server (host1). We have an account set up on the second server (host2). However, the IP seems to point to host1. How can I change it to where that IP will point to host2. The account is still set up on host2, but if you go to the domain name in a browser, you get the Apache page. Can anyone help? Please note, I'm not a real DNS expert.

Thanks

 

 

 

 

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