See this example properly formatted in the QUT Cite tool.
Standard in-text citation examples are in Getting started - In-text citation.
Author, A. A. (Year, Month DD). Title. Site Name. http://xxxxxx
Becker, G. (2011, January 2). Implications of international comparisons of student performance. The Becker-Posner Blog. https://www.becker-posner-blog.com/2011/01/implications-of-international-comparisons-of-student-performance-becker.html
Author, A. A. (Year, Month DD). Title or up to 20 first words of comment [Comment on the article/blog post "Title of article/blog post"]. Site Name. http://xxxxxx
Wilson, C. (2016, August 10). To me a literature review is about stating what other researchers think of the topic [Comment on the blog post "Literature Review vs. Essay"]. QUT Library. http://blogs.qut.edu.au/library/2012/09/26/literature-review-vs-essay/#comment-229197
If the person uses a username or tag, use the name as it appears in the comment.
Link to the URL for the comment itself if possible. Depending on your browser, you may be able to get this from the source code, elements or timestamp.