Go to your dashboard and press the plus (+) button to create a new mail tracking. A new page will appear, enter a name for your new mail tracking and press the create button. You will then see a dialog below 'Trackable URLs'. In the text field you need to enter the URL that you want to track and press the plus (+) button. The URL you have added will be added to the table below. That table row also contains a 'Trackable URL'. That is the URL you need to include in your email instead of the URL you entered. You can then send your email to the recipients. Go to your dashboard and press the mail tracking with the name that you created. Whenever there is some data tracked you will see it over there.