This screenshot is Step 1 of 3 in the Add Standby Database process of adding an existing RAC standby database. Near the top of this screenshot is a timeline indicating which step you are at in the process. As you proceed through the Add Standby Database process, the timeline will advance appropriately.
The first step in adding an existing RAC standby database is to select the RAC standby database that you want to add to the configuration. All discovered databases are shown in the bottom half of this screenshot.
At this time, you have three choices. You can click Cancel or Next. If you click Cancel, you terminate the current process and must begin again at the introductory page of the Add Standby Database wizard. This scenario assumes you are continuing to the next step.