Im confused

I can do the undo glitch but how do you click the cards so fast where you can finish within 5 seconds?

I saw that there were no verified runs in key mode and I wanted to try it, but the game mode doesn't seem to appear on my google snake game,

was it removed or do I need to do something to unlock it?

If I am waiting for a run to get verified and I get a new one which I want to upload should I edit the run currently waiting for Verica cation? should I submit a new one altogether? what would be the better option