What is this trying to say.

I have a Logitech M35 Mouse. I am trying to Use the middle mouse button, which has the roller to send CMD H.

I am not sure what this is trying to say. Do you want me to click on the blank space or do you want me to click on the +.

I can't seem to define the mouse key to do anything

ah, that message is outdated. The click recorder field is now in the side bar on the right