There isn't a way! Tasks in Confluence are very simple and they do not support comments or "statuses" besides "Complete or Incomplete" (checked or unchecked)
If you need comments on status changes you should consider moving this workflow into JIRA.
I was not able to get this to work. Item #6. How do I do this?
This is from your documentation.
To manage your tasks:
Hello @Edward Laxton, first and foremost I want to make a distinction: I do not work for Atlassian. Atlassian Answers is a user-support forum for Atlassian Products. I work for an Atlassian consultant, BlackPearl PDM, and like to help out around here. If you need support the method is support.atlassian.com.
Now, in response to your new question: The documentation you copied that bit from from is for Confluence 5.4. In Confluence 5.5 Tasks were reworked and now populate in a different spot on your profile. Please see the new documentation here: Confluence Latest: Add, Assign, and View Tasks
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