Our Comments system uses an independent registration, managed by the CommentBox platform. Like this even after you have subscribed to the Newsletter, you will need to register again to comment .
At the end of each post there is a dialog box with several authentication options:

If you choose to authenticate by email, you will need to create your CommentBox account before posting your comment. Please be aware of the registration link, as it is very discreet:

That is, both the Newsletter (whose subscription does not require a password, only the indication of email) and the Comments (whose participation also requires a password) are independent systems , with autonomous registrations.