WOW! I have never noticed there is an "Add your comment" button before! Why? It is because I try to read through all the post made, so I end up at the text box entry when I am ready to make my comment. Guess what? There is no "read the comments on the forum" link down here.
Yes, I knew there were forums. No, I didn't know the comments on the articles were associated with the forum and not the articles in the blog.
I think what we have is a failure to communicate - in other words, bad user interface design. The users are confused by your setup and inconsistencies between domains that are housed under the tomshardware domain.
The easiest solution? Get rid of comments on the article page and just leave a link to the forums to discuss. This is an intuitive user interface, and then there is no mystery about how to edit a post. Alternatively, show the comments but get rid of the comment box - replace it with a link "To comment, please visit our forum" link. Both would let me know that you are merely showing comments from a different part of your website.
My disappointment isn't that I have to go to a forum. It is that Tom's is a tech blog, but their unintuitive UI for commenting reflects on their "tech savvy-ness". Alternatively, the inability to have an edit button appear on my posts within the article comments also shows a lack of "tech savvy-ness".
A UI shouldn't be designed the way you like it - it should be designed for the Dilbert Principle. (the principle that says we are all idiots at one time or another...)