After the flag is clicked you will be given 3 seconds to get ready and then type the text that appears. Please note that if you make a mistake you will have to type it again. Accuracy is important! At the end, you will be shown how fast you were typing.
After spending hours upon hours on my first project https://scratch.mit.edu/projects/371670131/ I got lazy and decided to do a really easy one. And here it is! Updates: May 26th, 2020: It now shows your exact WPM instead of just the category like it used to.