Hi!
And welcome to the forum!
I might be stating something the obvious, and something you are very much aware of here; but out of the image you’ve added I read the problem as being the Simulate Keystroke field not being filled in. You’d need to click the field where it now says Type and then press the key, or combination of keys, you want this action to simulate.
If it is not this that is the problem, and the macro you are trying to get to work on your end have the Simulate Keystroke field filled in we’d need to know more what it is you want your macro to do, and how it is not working, for others to be able to help. Uploading the actual macro file is also aways advised.
How Do I Get The Best Answer in the Shortest Time to Questions on the KM Forum?
Edit: See now that @Airy bellow, maybe correctly, interpreted your post as stating the problem to be with the editor and not being able to create a new macros.