On the Dashboard (the screen that lists your draft and published newsletters), click the Cogwheel icon next to the name of the publication you want to change.
You'll be presented with 4 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 grey 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 Allow Public Subscriptions checkbox, you are enabling/disabling this feature. Don't forget to click the blue Save button when done.
Allowing or disallowing search engines to crawl your publication
By ticking or unticking the Make Newsletter Public 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. Don't forget to click the blue Save button when done.
Showing or hiding a publication in the archive
Each iNewsletter organization has an archive automatically generated for all their newsletters. This is a great page to link to from your website, where you may want readers to be able to go back and see previous newsletters.
If you don't want this publication to be visible in the archive (if you have a staff or internal newsletter for example) untick the List Publication in Archive option and click the blue Save button.
Allowing or disallowing liking of articles
iNewsletter includes a great feature which allows newsletter articles to be 'liked'. This is a great way to get feedback on which articles resonate with your community. Readers don't need an account to like articles, they can simply click the 'heart' icon and their like is recorded.
If you don't want readers to be able to like articles, untick the Allow readers to like articles option and click the blue Save button.