On the Dashboard click the Settings > General tab in the left bar
Scroll down to the Privacy Settings section
You'll be presented with 5 checkboxes which control the privacy settings of this publication.
Enabling or disabling public subscriptions
iNewsletter enables you to grow your audience by allowing public subscriptions. What this means is that anyone who comes across your newsletter can add themselves to the subscription list (via the Subscribe button on the cover page) so they will receive the email summary next time the newsletter is published. You may want to change this behaviour, so by ticking or unticking the Enable public email subscriptions checkbox, you are enabling/disabling this feature.
Allowing or disallowing search engines to crawl your publication
By ticking or unticking the Publication is public on the web button, you are enabling/disabling search engines such as Google, Yahoo, Bing and so on from crawling your newsletter. This is great if you want to keep your newsletter private and only allow a certain audience to read the newsletter.
Enabling or disabling archiving of newsletters
Each publication has an archive of past newsletter issues enabled by default. When you publish each newsletter, you are given a URL for this archive. Readers can also click the View Archive button in the top menu when reading your newsletters to see the archive.
If you don't want to have an archive of past newsletters, you can disable archiving. This means readers won't be able to browse past newsletters, unless they have a link to a specific newsletter. The option Create an archive of issues for this publication decides whether iNewsletter will create an archive or not.