After confirming your Device UID the licensing system will generate the license compatible with your device(s). To load it inside Rhino you can reload Rhino Nature section in an Options window and it will autoload your license from the server. If you have already a different license loaded (e.g. Trial) you can copy/save the new one and paste/open using context menu. To finalize the whole procedure, all you need to do is click the Activate license button.