Hi Melani,
Welcome to the forums and thank you for choosing Event Tickets Plus!
1. You can edit the ticket by creating a template override as explained in our Themer’s Guide. The file you’ll need to overwrite is /event-tickets-plus/src/views/wootickets/tickets.php.
2. If you haven’t already, visit WooCommerce > Settings > Emails and also Events > Settings > Tickets and scroll to the bottom of the page and check the box (See screenshot below).

If that doesn’t work, try adding the snippet found here to your theme’s functions.php file.
Let me know how it goes and thanks again. Cheers 🙂