If all comments are not showing under a Blog post, it's because the user never verified their comments. Verification is necessary to prevent spam from showing on your Blog.
Here is how you can manually verify a comment:
- login to your FASO account Control Panel
- click Blog icon (upper row)
- click Edit next to the blog entry in question
- click Go to Comments next to Visitor Comments (scroll down)
- click Edit to the right of the comment
- for Comment Verified click for Yes (so it shows)
- click Save Changes
- repeat for each Comment
Another option: Don't fret over displaying comments that users don't bother to verify.