How to change "New Subscriber" Email Content

I would like to change the content of the “New subscriber” email a subscriber receives after clicking the “Confirm your subscription” buttion.

Here’s what is currently looks like.

Howdy,

The subscriber rmclaughlin@opessoftware.com has just subscribed to your list ‘FATCA 8966 – Trial Version’

Cheers,

The MailPoet Plugin

Thanks!

https://wordpress.org/plugins/wysija-newsletters/