Edit Text and Add link (URL) to Tracking number on Completed Email

Hi there,

I have purchased the Premium plugin, and I’m including tracking information to the ‘completed’ woocommerce email template. I want to add the ‘URL/link’ to the tracking number an customize the text. You are saying this “”You can customize tracking number and carrier html which are displayed after every order item in email(if selected) or on My account/Order details page”” but cannot understand at all what does this mean nor where can I find this to customize it