The RRC (Rapid Recovery Console) is the single pane of glass management console for all of Unitrends appliances. You are seeing this particular introductory screen because you have yet to accept the browser security exception for the local system ("localhost").
To go to the RRC, you should click on this link. You will see a browser certificate exception warning. Once you add the exception in the console browser window, you will not see this message again when you login to the console, and instead will go directly to the RRC.