How can the users unsubscribe from the newsletter?
In the Newsletter Manager free and premium plugins, we are providing the subscription form only.
The user cannot unsubscribe using a form.
Your users can unsubscribe from your newsletters, if you are adding the unsubscribe link in the campaign/newsletter.
If you want to add the unsubscribe link with the newsletter, please add the variable {unsubscribe-url} in the newsletter campaign.
This variable will be replaced with the original unsubscribe link in the campaign.
If anyone clicks on the link, they will be unsubscribed from the list.