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leatherface:
What I understand of your question is that you want to let anonymous users to be able to post comments. If this is so, just go to the admin side of XOOPS. Now click on the News module icon.
In the index page, you'll see a header with some tabs and links. The top left link says "Module settings". Click on it.
Almost at the end of this form there's this setting: "Allow anonymous post in comments?". Select "Yes" and then click at the end of the form in the "Go!" button.
Now your anonymous users will be able to see the "Post comment" button in the news.
Cheers.