Newbie screwed up brand new VPS using WHM

Newbie screwed up brand new VPS using WHM: "4. Click the Add Entry button, then click the Close button.

In WHM > Change Hostname area:

1. Enter the new hostname in the "New Hostname:" field, then click the "Change" button.

2. Click the "Add an A entry for your hostname" button

3. Click the "Add entry" button upon reviewing the IP listed.

After doing the above, go to your domain registrar if you have not already and register your new nameservers with the IPs you've used above for the WHM > Basic cPanel & WHM Setup area. If you haven't registered the nameservers at your registrar, then the nameservers will not function yet.
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