I want to add a comment to an open ticket, and it is not possible.
If I experimentally try to click on “new ticket” I get the following error:
TICKET_CREATE privileges are required to perform this operation
I think I have read somewhere that any user can(is allowed to) write a ticket. So now I’m a little confused.
thank you, you were right.
But it is confusing, because on dev.haiku-os.org I can “login” with the account from haiku-os.org. (The account I’m using to post here on the forum).
After I made a new account it worked.
Look here under “Logging In” (near the top):
http://dev.haiku-os.org/
You need to create an account on the site before you can create and add to tickets. This account is separate from your www.haiku-os.org one.
You must also have your e-mail address verified before you can create or post to tickets.
I believe that is a bug and not a feature. 
I would say to create a ticket if one does not exist and assign it to the web team to look into it.