Comments are enabled on posts by default and you can control comment order, threaded comments and paging using Settings > Discussion in your dashboard.
Change Comment Order
By default, comments are displayed in order with the older comments at the top of each page. This is the most common comment order used as it makes it easier to see the history of a conversation in comments.
If you want your readers to see the most recent comment first you can change it to display the newest comments at the top as follows:
1. Go to Settings > Discussion.

2. Select Newer from the dropdown menu under Other Comment Settings.

3. Click Save Changes at the bottom of the page.
Change Threaded Comments
Threaded comments allow readers to reply to other comments inline/nested which encourages better discussion and responses. This means you can reply to a comment directly regardless of when the original comment was posted, and your comment will appear just below the original comment.
By default, threaded comments are set to 5 levels deep. You can control the number of levels deep you allow in your comment threads, from 1 to 10.
Here is an example of a two deep threaded comment on the post:

You change your threaded comment option as follows:
1. Go to Settings > Discussion.

2. Select your preferred threaded level from the dropdown menu under Other Comment Settings.

3. Click Save Changes at the bottom of the page.
Breaking Comments into Paging
If you have a lot of comments you can break your comments into pages. This helps reduce the amount of scrolling.
You set up comment paging as follows:
1. Go to Settings > Discussion.

2. Select “Break comments into pages with”, choose your number of top level comments and choose which page is displayed by default.
In this example, the last comment page is displayed first and each page has 50 top level comments.

3. Click Save Changes at the bottom of the page.