The next step is to add the Xbees to the XCTU software. Begin by clicking on the Discover radio modules icon from the toolbar. In the Discover radio devices dialog, select the serial port(s) in which to look for radio modules. If the user does not know the serial ports where the modules are attached, select all ports. Click Next. In the Set port parameters window, maintain the default values and click Finish. As XCTU locates radio modules, they appear in the Discovering radio modules dialog box. Once the discovery process has finished, click Add selected devices. At this point, assuming two modules are connected to the computer, the user should see something like the image shown on this slide in the Radio Modules section on the left. Note: the port number and MAC address do not necessarily have to be equal as shown in the image.