Have you tried opening a Fusion session and listening to the online video simultaneously in a step by step fashion? I found myself listening to a small portion of the video, pausing it, then going over to the open Fusion session and performing the exact steps outlined in the video --- and repeating this ad infinitum. This worked for me. It took forever, but I finally got somewhere with it.
Also, I found instructional videos done by Fusion users on YouTube far more helpful than those done by Autodesk. Lars Christensen, for example, has a great series for beginners, as does ProductDesignOnline. Lars does a multi-video series on building an electrical box. I did the pause method for every step in that series and it worked great.
But for your specific question about the Data Panel,
this Autodesk video is pretty good.
HTH, and good luck. Stick with it and you'll get there!!
Bill