Why can't I respond to a post in the Articles forum?

[HP67]

Is this normal?

I wanted to post a comment in https://www.hpmuseum.org/forum/thread-16007.html but I am unable to

I get a screen that says:

You do not have permission to access this page. This could be because of one of the following reasons:
Your account has either been suspended or you have been banned from accessing this resource.
You do not have permission to access this page. Are you trying to access administrative pages or a resource that you shouldn't be? Check in the forum rules that you are allowed to perform this action.
Your account may still be awaiting activation or moderation. (Resend Activation Code)
You have accessed this page directly rather than using appropriate forms or link.

You are currently logged in with the username: 'HP67'

Thanks