When you contract a domain with Muumuu Domain, there are DNS settings. By copying and pasting the following JavaScript into a bookmarklet or developer tools, you can easily fill in the items.
The following example is for xserver.
# xserver dns JavaScript
document.querySelector('#dns_1').value = 'ns1.xserver.jp' ;
document.querySelector('#dns_2').value = 'ns2.xserver.jp' ;
document.querySelector('#dns_3').value = 'ns3.xserver.jp' ;
document.querySelector('#dns_4').value = 'ns4.xserver.jp' ;
document.querySelector('#dns_5').value = 'ns5.xserver.jp' ;