If your domain is registered elsewhere and your hosting is with us, set the domain's nameservers to:
ns1.ukbox.host
ns2.ukbox.host
At your registrar, find Nameservers or DNS management, replace whatever is listed with the two above, and save. Changes usually take effect within a few hours and always within 48 — your site keeps working from the old settings until the change completes.
Receiving email on this domain elsewhere? Contact us before changing nameservers so we can prepare your mail records first — that way nothing bounces during the switch.
Reference page: nameservers & IPS tag.