Go to your registrar's website and set the nameservers for your domain to:

ns1.geoscaling.com

ns2.geoscaling.com

ns3.geoscaling.com

ns4.geoscaling.com

ns5.geoscaling.com

Before or after you do this, add the domains in your GeoScaling account and add some records.

It can take up to 48 hours (usually much less) until GeoScaling takes control of your domain after you changed the nameservers, so please be patient.