Every registrar may have a slightly different method of actually implementing a nameserver change. You can always contact their support system if you need help.
Generally, you’ll have to find the nameserver options of your domain and change them to the ones below:
ns1.wpdns.host
ns2.wpdns.host
ns3.wpdns.host
Once the new nameservers have been saved, it can take between 24 and 48 hours for the new settings to propagate across the Internet.