Click on the "Settings" buttton to adjust settings available with CDXStreamer.
And you'll see the following dialog:
From here you can activate or deactivate the Undo/Redo feature, and whether software instructions are shown upon starting the software. (You can always view these instructions by clicking on the appropriate button here.) Also, to check for any software updates to CDXStreamer, click on the "Check For Updates" button and you will be notified whether you have the most recent version of the software. Follow the subsequent instructions to download and install the most recent version, if desired.