You do not need to use this plugin anymore! Jepack now includes its own subscription form shortcode: [jetpack_subscription_form]. You can read more about it here: Jetpack Support documentation: Subscriptions
Extends the Jetpack plugin and allows you to add a Subscription form anywhere inside your posts thanks to the [jpsub] shortcode
Important: for this plugin to work, you must activate
Jetpack first, and activate the Subscriptions module.
This plugin is a work in progress. You can report issues
here, or submit a pull request
on GitHub.