Navigating comments is accomplished with the j and k keys. When you first visit the Comments page, no comments is selected, so, first press the letter j, or the letter k, to select the first comment. After that, just press the letter j to move the select to the next comment.
- Pressing j moves the current selection (light-blue background) down.
- Pressing k moves the current selection (light-blue background) up.
Note that if you come to the bottom of a page of comments and press j again, you will be taken to the next page and the first comment of that next page will be selected. Likewise, pressing k at the top of a comment page will zoom you to the previous page, selecting the comment at the bottom of that previous page. This makes it very easy to navigate through a long list of comments to perform the necessary actions.