Below are links to a series of videos on how to get started using the FREE JMRI DecoderPro software. The videos are all on the YouTube Channel of The DCC Guy Larry Puckett. If that name sounds familiar, Larry Puckett of course has been a contributing editor at Model Railroader Magazine.
DecoderPro Menus – https://youtu.be/yNXrQE_VvL8
Adding a new loco in DecoderPro Part 1 – https://youtu.be/DtOFKEQt78I
Adding a new loco in DecoderPro Part 2 – https://youtu.be/eHxgh6rs9ZI
Adding a new loco in DecoderPro Part 3 – https://youtu.be/x-aIJqnE1_E
Adding a new loco in DecoderPro Part 4 – https://youtu.be/OqNCnWVyOpA
Adding a new loco in DecoderPro Part 5 – https://youtu.be/A-lHhLWgjaQ
While you are there on the channel, we highly recommend subscribing. Larry puts out a great deal of great information about Model Railroading on a regular basis on his YouTube Channel – https://www.youtube.com/c/TheDCCGuy/featured.