Please see https://cp.thenames.co.uk/kb/servlet/KBServlet/faq580.html for information about managing DNS records on your doman name.
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Change Nameservers
Please see https://cp.thenames.co.uk/kb/servlet/KBServlet/faq455.html for information on how to change the nameservers on your domain name
DNS propagation
Upon modifying your domain name’s Name Servers or DNS records, your website would begin appearing in a web browser, after about 24 to 48 hours (provided your Web Hosting package is properly setup and you have uploaded the content of your website). This is a standard time-frame required for a process called DNS Propagation to complete Worldwide. This process is not controlled by any one ISP/company and therefore it cannot be hastened.