Subscribe How do I modify the text of the email "confirm subscription"

How do i modify the email text of the Subscribe email?

By default it says this:
Howdy.

You recently signed up to be notified of new posts on my blog. This means once you confirm below, you will receive an email when posts are published.

To activate, click confirm below. If you believe this is an error, ignore this message and nothing more will happen.

Thanks!