Haha, I guess that proves my point about discoverability!
First you hit "Start a review" when viewing a pull request. You can then click on any change and it opens a comment box - in that box, you add hit the button with a plus and minus symbol on it. It then adds the existing code in the box, and you can change it.
First you hit "Start a review" when viewing a pull request. You can then click on any change and it opens a comment box - in that box, you add hit the button with a plus and minus symbol on it. It then adds the existing code in the box, and you can change it.
Better explained here: https://help.github.com/en/articles/commenting-on-a-pull-req...