To create a new roundrobin, click the Add a new DNS roundrobin link on this page. On the form that appears you will need to select one or more managed systems that the roundrobin DNS entry will resolve to, which can be done on a per-system basis, by group or by owner. You will also need to select the DNS zone to add the roundrobin record to, and enter a hostname within the zone.
After a roundrobin has been created, it can be edited from this page by clicking on the domain name. One or more roundrobins can also be removed by checking the boxes next to the name and clicking Delete Selected Roundrobins. This will also remove the DNS record.
Roundrobins will be updated after each of Cloudmin's background status checks, which by default happen every 5 minutes. You can also force an immediate update with the Refresh Roundrobins button.