Shortcode
Using the shortcode [wpeppsub_register] you can allow your customers to become a non paying member of your site.
The shortcode will display a register form that looks like this:
When they register they will receive an email containing a link to create a password for their account.
Limit Content
You can choose to limit content to these free subscribers. In any page or post just choose “Free Subscriber” from the Subscriptions MetaBox