I can't get this Smart Dimmer to work
There are completed instructions on the web. You will have to use the white jumper included with the switch or get a 6&quot; piece of white #14 AWG and connect it to the two white wired in the box and then connect the other end to the neutral terminal on the switch. Read your complete instructions, especially #10 under the &quot;wire strip lengths&quot;.
Here is a cut &amp; paste provided by Harper that shows the missing part of the instructions. I have edited it into my answer with his blessing.