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.