1) Login to your client area at https://portal.ajrbcloud.uk

2) Select 'Domains' on the left pane

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3) Select the ellipses of the domain you wish to change the nameservers for, and then click 'Manage Nameservers'

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4) Click 'Use custom nameservers' and enter the desired nameservers

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Click 'Change Nameservers'

Note that these changes will be applied instantly to the domain registry, but DNS by design may take 24-48 hours to propagate globally (although these changes typically take effect within a few minutes).