Can I have a custom command to press a function key, like f9?
Yes you can setup a custom command for function keys.
Thanks. It seems that it just typing the words I say for custom commands. Actually, it's doing that for the built in commands as well. I'm using Edge.
Did you try ? Also try a simple example and see if that works.
If that doesn't, can you record your screen (you can use Loom or any other tool) and share the video at email@example.com?